英語の不定詞と動名詞って、どちらも「〜すること」って意味だけど、使い分けがあるって知ってた？実は動詞によって後ろに来る形が決まってるんだ。この使い分けをマスターすれば、英語のテストでもう迷わない！
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Updated Mar 23, 2026
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不定詞と動名詞の使い方ガイド: 違いと使い分け
1 / 5
不定詞と動名詞の基本
不定詞（to + 動詞の原形）と動名詞（動詞の-ing形）は、どちらも「〜すること」という意味で名詞の働きをするよ。主語や目的語、補語になれるんだ。
主語や補語として使うときは、どちらを使っても意味はほぼ同じ。でも動詞の目的語になるときは要注意！動詞によってルールが決まってるから、これがテストのポイントになる。
覚えておこう！ 不定詞は「to + 動詞の原形」、動名詞は「動詞 + ing」の形だよ。
例えば「To get up early is good」も「Getting up early is good」も同じ意味だけど、「I want to visit Kyoto」は「I want visiting Kyoto」とは言えないんだ。
動名詞だけをとる動詞
過去のことや習慣、やめることを表す動詞は動名詞しか取れない。これらの動詞を覚えよう！
主要な動詞：enjoy（楽しむ）、finish（終える）、stop（やめる）、mind（気にする）、give up（あきらめる）、practice（練習する）、avoid（避ける）
例文で確認すると、「My brother enjoys playing video games」「I finished doing my homework」みたいに使うよ。これらの動詞の後ろにto不定詞を置くのは間違いだから注意して。
テストのコツ 動名詞グループは「メガフェプス（megafeps）」みたいな語呂合わせで覚えるのもアリ！
特にstopは要注意。「stop eating」（食べるのをやめる）という意味になるけど、「stop to eat」だと意味が変わっちゃうから後で詳しく説明するね。
不定詞だけをとる動詞と意味が変わる動詞
未来のことや意志を表す動詞は不定詞しか取れない。want（したい）、hope（望む）、decide（決める）、plan（計画する）、promise（約束する）が代表的だよ。
例：「I want to be a doctor」「She decided to study abroad」のように、これから起こることについて話すときに使うんだ。
でも一番難しいのが、両方取れるけど意味が変わる動詞！remember、forget、try、stopがこのグループ。
超重要ポイント 過去のことなら-ing、これからのことならto doで覚えよう！
例えばrememberは「I remember meeting him」（彼に会ったことを覚えている＝過去）と「Please remember to post this letter」（手紙を投函することを忘れずに＝未来）で全然意味が違うよ。
特に注意すべき動詞の使い分け
tryとstopの使い分けは超重要だから、しっかり理解しておこう！
try + 動名詞は「試しに〜してみる」、try + 不定詞は「努力して〜しようとする」という意味。「I tried using this app」（このアプリを試しに使ってみた）と「He tried to open the door」（ドアを開けようと努力した）では全然違うよね。
stopの使い分けも要チェック！「He stopped smoking」は「タバコをやめた」だけど、「He stopped to smoke」は「タバコを吸うために立ち止まった」という意味になる。
ひっかけ注意！ 「stop to do」のtoは目的を表す副詞的用法で、stopの目的語じゃないよ！
forgetも同様で、「forget doing」は過去のことを忘れる、「forget to do」は未来にすることを忘れるという違いがあるんだ。
テスト対策の重要ポイント
まず動詞のリスト暗記が基本！動名詞グループ（enjoy, finish, mind...）と不定詞グループ（want, hope, decide...）を覚えよう。
前置詞の後ろは必ず動名詞っていうのも超重要ルール！「look forward to seeing」「thank you for helping」のように、前置詞の後に動詞が来たら必ず-ing形になる。
特に「look forward to」のtoは前置詞だから、後ろは動詞の原形じゃなくて動名詞。これはテストのひっかけ問題でよく出るから要注意だよ。
合格への近道 意味が変わる動詞（remember, try, stop, forget）は例文ごと丸暗記がおすすめ！
練習問題をたくさん解いて、どの動詞がどの形を取るか体で覚えることが大切。パターンを覚えれば、テストでも迷わずに答えられるようになるよ！
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in 英語コミュニケーション
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
不定詞と動名詞の使い方ガイド: 違いと使い分け
英語の不定詞と動名詞って、どちらも「〜すること」って意味だけど、使い分けがあるって知ってた？実は動詞によって後ろに来る形が決まってるんだ。この使い分けをマスターすれば、英語のテストでもう迷わない！
不定詞と動名詞の基本
不定詞（to + 動詞の原形）と動名詞（動詞の-ing形）は、どちらも「〜すること」という意味で名詞の働きをするよ。主語や目的語、補語になれるんだ。
主語や補語として使うときは、どちらを使っても意味はほぼ同じ。でも動詞の目的語になるときは要注意！動詞によってルールが決まってるから、これがテストのポイントになる。
覚えておこう！ 不定詞は「to + 動詞の原形」、動名詞は「動詞 + ing」の形だよ。
例えば「To get up early is good」も「Getting up early is good」も同じ意味だけど、「I want to visit Kyoto」は「I want visiting Kyoto」とは言えないんだ。
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
動名詞だけをとる動詞
過去のことや習慣、やめることを表す動詞は動名詞しか取れない。これらの動詞を覚えよう！
主要な動詞：enjoy（楽しむ）、finish（終える）、stop（やめる）、mind（気にする）、give up（あきらめる）、practice（練習する）、avoid（避ける）
例文で確認すると、「My brother enjoys playing video games」「I finished doing my homework」みたいに使うよ。これらの動詞の後ろにto不定詞を置くのは間違いだから注意して。
テストのコツ 動名詞グループは「メガフェプス（megafeps）」みたいな語呂合わせで覚えるのもアリ！
特にstopは要注意。「stop eating」（食べるのをやめる）という意味になるけど、「stop to eat」だと意味が変わっちゃうから後で詳しく説明するね。
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
不定詞だけをとる動詞と意味が変わる動詞
未来のことや意志を表す動詞は不定詞しか取れない。want（したい）、hope（望む）、decide（決める）、plan（計画する）、promise（約束する）が代表的だよ。
例：「I want to be a doctor」「She decided to study abroad」のように、これから起こることについて話すときに使うんだ。
でも一番難しいのが、両方取れるけど意味が変わる動詞！remember、forget、try、stopがこのグループ。
超重要ポイント 過去のことなら-ing、これからのことならto doで覚えよう！
例えばrememberは「I remember meeting him」（彼に会ったことを覚えている＝過去）と「Please remember to post this letter」（手紙を投函することを忘れずに＝未来）で全然意味が違うよ。
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
特に注意すべき動詞の使い分け
tryとstopの使い分けは超重要だから、しっかり理解しておこう！
try + 動名詞は「試しに〜してみる」、try + 不定詞は「努力して〜しようとする」という意味。「I tried using this app」（このアプリを試しに使ってみた）と「He tried to open the door」（ドアを開けようと努力した）では全然違うよね。
stopの使い分けも要チェック！「He stopped smoking」は「タバコをやめた」だけど、「He stopped to smoke」は「タバコを吸うために立ち止まった」という意味になる。
ひっかけ注意！ 「stop to do」のtoは目的を表す副詞的用法で、stopの目的語じゃないよ！
forgetも同様で、「forget doing」は過去のことを忘れる、「forget to do」は未来にすることを忘れるという違いがあるんだ。
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
テスト対策の重要ポイント
まず動詞のリスト暗記が基本！動名詞グループ（enjoy, finish, mind...）と不定詞グループ（want, hope, decide...）を覚えよう。
前置詞の後ろは必ず動名詞っていうのも超重要ルール！「look forward to seeing」「thank you for helping」のように、前置詞の後に動詞が来たら必ず-ing形になる。
特に「look forward to」のtoは前置詞だから、後ろは動詞の原形じゃなくて動名詞。これはテストのひっかけ問題でよく出るから要注意だよ。
合格への近道 意味が変わる動詞（remember, try, stop, forget）は例文ごと丸暗記がおすすめ！
練習問題をたくさん解いて、どの動詞がどの形を取るか体で覚えることが大切。パターンを覚えれば、テストでも迷わずに答えられるようになるよ！
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user