受動態って難しく感じるかもしれないけど、実は簡単なルールを覚えるだけで使えるようになるんだ。「〜される」「〜された」という表現で、何がされたかを強調したいときに使う文の形だよ。
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Updated Apr 22, 2026
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受動態の基本的な使い方
1 / 5
受動態の基本
受動態は普通の文とは視点が違うんだ。普通の文（能動態）が「誰がする」に注目するのに対して、受動態は「何がされる」に注目する。
例えば「ケンがこのコンピューターを使う」なら、「このコンピューターがケンに使われる」という感じ。誰がやったかより、何がされたかの方が大事なときに便利だよ。
基本の形はこれだけ覚えればOK：主語 + be動詞 + 過去分詞 。be動詞は主語と時制によって変わるから、現在形なら am/is/are、過去形なら was/were を使う。
💡 ポイント: 過去分詞は動詞の3番目の形（write-wrote-written の written）。不規則動詞はしっかり覚えておこう！
能動態から受動態への書きかえ
書きかえは3つのステップで完璧にできる。テストでもこの順番通りにやれば間違えないよ。
ステップ1: 能動態の目的語（動詞の後ろの「〜を」）を、受動態の主語にする。ステップ2: 動詞を「be動詞 + 過去分詞」に変える。be動詞は新しい主語と時制に合わせよう。
ステップ3: 元の主語を「by + 行為者」にして文末に置く。代名詞なら目的格に変えるのを忘れずに（I → by me、He → by him）。
💡 コツ: 「My father built this house」→「This house was built by my father」みたいに、文の構造がガラッと変わるイメージを持とう！
例文で練習してみよう
実際の例文で書きかえをやってみると、パターンが見えてくるよ。
現在形の例: 「Emi writes these letters」→「These letters are written by Emi」。主語が複数形（these letters）だから、be動詞は are になる。
過去形の例: 「My father built this house」→「This house was built by my father」。新しい主語が単数形だから、be動詞は was を使う。
書きかえのときは、まず元の文の主語・動詞・目的語を見つけることから始めよう。それができれば、あとは機械的に変換するだけだ。
💡 確認ポイント: be動詞の形と過去分詞の形、この2つが正しければ8割は成功！
テストで注意するポイント
テストでよくある間違いを知っておけば、確実に点数アップできる。
一番多い間違いは be動詞を忘れること。「This car made in Japan」じゃなくて「This car is made in Japan」が正解。be動詞がないと文として成り立たないんだ。
be動詞の形にも注意。主語が複数なら are、単数なら is/was。「The rooms is cleaned」は間違いで、「The rooms are cleaned」が正解だよ。
「by + 行為者」の省略も覚えておこう。行為者が分からないときや、言う必要がないときは by〜 を省略することが多い（例：English is spoken in many countries）。
💡 最重要: 「be動詞 + 過去分詞」のセットを絶対に忘れないこと！これさえ覚えていれば大丈夫。
まとめ（要点チェック）
受動態の核心部分を最終確認しよう。
基本形: 主語 + be動詞 + 過去分詞 で、意味は「〜される」「〜された」。be動詞は主語と時制で使い分け、過去分詞は不規則動詞もしっかり覚える。
書きかえでは能動態の目的語が受動態の主語になることを忘れずに。by の省略は行為者が不明・不要なときに使う。
とにかく「be動詞 + 過去分詞」のセットが受動態の命。この形さえマスターすれば、英語の表現力がグッと広がるよ！
💡 自信を持って: ルールはシンプルだから、練習すれば必ずできるようになる。一歩ずつ進んでいこう！
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 英語表現
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
受動態の基本的な使い方
受動態って難しく感じるかもしれないけど、実は簡単なルールを覚えるだけで使えるようになるんだ。「〜される」「〜された」という表現で、何がされたかを強調したいときに使う文の形だよ。
受動態の基本
受動態は普通の文とは視点が違うんだ。普通の文（能動態）が「誰がする」に注目するのに対して、受動態は「何がされる」に注目する。
例えば「ケンがこのコンピューターを使う」なら、「このコンピューターがケンに使われる」という感じ。誰がやったかより、何がされたかの方が大事なときに便利だよ。
基本の形はこれだけ覚えればOK：主語 + be動詞 + 過去分詞 。be動詞は主語と時制によって変わるから、現在形なら am/is/are、過去形なら was/were を使う。
💡 ポイント: 過去分詞は動詞の3番目の形（write-wrote-written の written）。不規則動詞はしっかり覚えておこう！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
能動態から受動態への書きかえ
書きかえは3つのステップで完璧にできる。テストでもこの順番通りにやれば間違えないよ。
ステップ1: 能動態の目的語（動詞の後ろの「〜を」）を、受動態の主語にする。ステップ2: 動詞を「be動詞 + 過去分詞」に変える。be動詞は新しい主語と時制に合わせよう。
ステップ3: 元の主語を「by + 行為者」にして文末に置く。代名詞なら目的格に変えるのを忘れずに（I → by me、He → by him）。
💡 コツ: 「My father built this house」→「This house was built by my father」みたいに、文の構造がガラッと変わるイメージを持とう！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
例文で練習してみよう
実際の例文で書きかえをやってみると、パターンが見えてくるよ。
現在形の例: 「Emi writes these letters」→「These letters are written by Emi」。主語が複数形（these letters）だから、be動詞は are になる。
過去形の例: 「My father built this house」→「This house was built by my father」。新しい主語が単数形だから、be動詞は was を使う。
書きかえのときは、まず元の文の主語・動詞・目的語を見つけることから始めよう。それができれば、あとは機械的に変換するだけだ。
💡 確認ポイント: be動詞の形と過去分詞の形、この2つが正しければ8割は成功！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
テストで注意するポイント
テストでよくある間違いを知っておけば、確実に点数アップできる。
一番多い間違いは be動詞を忘れること。「This car made in Japan」じゃなくて「This car is made in Japan」が正解。be動詞がないと文として成り立たないんだ。
be動詞の形にも注意。主語が複数なら are、単数なら is/was。「The rooms is cleaned」は間違いで、「The rooms are cleaned」が正解だよ。
「by + 行為者」の省略も覚えておこう。行為者が分からないときや、言う必要がないときは by〜 を省略することが多い（例：English is spoken in many countries）。
💡 最重要: 「be動詞 + 過去分詞」のセットを絶対に忘れないこと！これさえ覚えていれば大丈夫。
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
まとめ（要点チェック）
受動態の核心部分を最終確認しよう。
基本形: 主語 + be動詞 + 過去分詞 で、意味は「〜される」「〜された」。be動詞は主語と時制で使い分け、過去分詞は不規則動詞もしっかり覚える。
書きかえでは能動態の目的語が受動態の主語になることを忘れずに。by の省略は行為者が不明・不要なときに使う。
とにかく「be動詞 + 過去分詞」のセットが受動態の命。この形さえマスターすれば、英語の表現力がグッと広がるよ！
💡 自信を持って: ルールはシンプルだから、練習すれば必ずできるようになる。一歩ずつ進んでいこう！
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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Most popular content in 英語表現
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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