一、主動語態
主語是謂語動作的使動方。也就是說謂語的動作源自主語，而施加于賓語。相反，被動語態中，主語是謂語動作的受動方，如果有賓語的，賓語往往是謂語動作的使動方。 在語法機構上，主動語態和被動語態的區別主要在于，主動語態直接使用動詞原形作為謂語，然后再在該動詞原形的基礎上施加時態和其他語法；而被動語態則使用系詞+動詞的過去分詞作為謂語，各種時態和其他語法也施加在系詞上。
二、被動語態
英語中的被動語態使用得比漢語要多，要普遍，許多課本及考試乃至實際應用中都常常涉及到這個問題。一般說來，當強調動作承受者，不必說出執行者或含糊不清的執行者時，多用被動式。須注意的是，許多地方與漢語不同。注意那些漢語中沒有"被……"的意思，英語卻應該用被動態。還要注意，英語的被動態往往由"by"引出，而有用介詞"by"的短語往往又不是被動態，而是系表結構。還有些特殊現象，如：known to man(人類......所知)，on foot步行(美國人有時用by foot)，in carraige(乘四輪馬車)等等。
還有假主動，真被動的十幾個常用詞的用法，以及so heavy to carry而不用so heavy to be carried 等習慣用法。有關這類情況，做到心中有數對全面掌握被動態，en211 準確解答習題非常關鍵，被動態必須涉及的是動詞的各種時態變化的問題。英語的'時態本來很復雜，怎樣記住各自的被動形式呢? 首先要明確"將來進行無被動，現在完成進行同"。這兩種時態無被動形式。
另外，不及物動詞帶有同源賓語的動詞，反身代詞的動詞和系動詞都無被動形式。即便如此，還有不定式，動名詞，分詞，以及它們的復合結構)的被動態，再加上情態動詞，助動詞以及它們的疑問式和否定式從中摻雜，真是令人頭痛，眼花繚亂。下面口訣就以動詞do為例，即do did過去式done過去分詞，以口訣形式總結各種時態的被動態，一定對你有所啟示。 被動語態的句子通常是以Be-Passive(即"be+過去分詞")的形式來表達，但也可以Get-Passive(即"get+過去分詞")的形式來表達，例如：He got punished today. Get-Passive是一種新興的被動語態形式；相對來說它的使用還沒有Be-Passive那么廣泛，一般限于口語和非正式書面語；但它卻有著用得愈來愈多的趨勢，是一種生氣蓬勃的語言現象。 如果要特別強調動作或行為的執行者時，句子后面需接by～，譯為“被（由）……”。
1 被動語態的句型 肯定句：主語+be +過去分詞+（by～）. 否定句：主語+be not +過去分詞+（by～）. 一般疑問句：Be +主語+過去分詞+（by～）？ 特殊疑問句：疑問詞+be +主語+過去分詞+（by～）？ 被動語態的時態是由be的時態決定的，be是什么時態，全句就是什么時態，be動詞后面的過去分詞不變。
一、 被動語態的用法：
一般現在時的被動語態構成：is / am / are + 及物動詞的過去分詞 Our classroom is cleaned everyday. I am asked to study hard. Knives are used for cutting things.
2. 一般過去時的被動語態構成：was / were + 及物動詞的過去分詞 A new shop was built last year. Dinosaur eggs were laid long long ago.
3. 一般將來時的被動語態構成：will+ be + 及物動詞的過去分詞 A new hospital will be built in our city. Many more trees will be planted next year.
4. 現在進行時的被動語態構成：am / is / are + being + 及物動詞的過去分詞 Uncle Wang is mending my bike now.→ My bike is being repaired by Tom now. They are planting trees over there. → Trees are being planted over there by them.
5. 現在完成時的被動語態構成：has / have + been + 及物動詞的過去分詞 This book has been translated into many languages. Many man-made satellites have been sent up into space by many countries.
6.過去進行時的被動語態構成：was/were + being + 及物動詞的過去分詞 The boy was being operated on when his parents hurried to the hospital. The new road was being made.
7.過去完成時的被動語態構成：had + been + 及物動詞的過去分詞 The classroom hadn’t been cleaned before the teacher came. The tickets had been sold out berore I came to the cinema.
8.將來完成時的被動語態構成：shall/will + have done They will have been married for 20 years by then. The project will have been completed before May.
9.含有情態動詞的被動語態構成：情態動詞+ be + 及物動詞的過去分詞 Young trees must be watered often. Your mistakes should be corrected right now. The door may be locked inside. Your homework can be handed in tomorrow.
二、 怎樣把主動語態改成被動語態?
把主動語態改為被動語態非常簡單，可以遵循以下幾個步驟：
1. 先找出謂語動詞；
2. 再找出謂語動詞后的賓語；
3. 把賓語用作被動語態中的主語；
4. 注意人稱、時態和數的變化。 例：1. Bruce writes a letter every week. →A letter is written by Bruce every week. 2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning. 3. He has written two novels so far.→Two novels have been written by him so far. 4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow. 5. Lucy is writing a letter now.→A letter is being written by Lucy now. 6. You must lock the door when you leave.→the door must be locked when you leave.
三、 使用被動語態應注意的幾個問題：
1. 不及物動詞無被動語態。 What will happen in 100 years. The dinosaurs disappeared about 65 million years ago.
2. 有些動詞用主動形式表示被動意義。 This pen writes well. This new book sells well.
3. 感官動詞或使役動詞使用省略to的動詞不定式，主動語態中不帶to ，但變為被動語態時，須加上to 。 例：make somebody do something→somebody+ be +made to do something see somebody do something→somebody +be +seen to do something A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by. The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.
4. 如果是接雙賓語的動詞改為被動語態時，直接賓語(物)作主語，那么動詞后要用介詞，這個介詞是由與其搭配的動詞決定。 He gave me a book.→A book was given to me by him. He showed me a ticket.→A ticket was shown to me by him. My father bought me a new bike. →A new bike was bought for me by my father.
5. 一些動詞短語用于被動語態時，動詞短語應當看作一個整體，而不能丟掉其中的介詞或副詞。 We can’t laugh at him. →He can’t be laugh at by us. He listens to the radio every day. →The radio is listened to by him every day. The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse
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