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來源：網絡資源 2023-02-18 20:03:14
被動語態的構成形式
1. 被動語態的基本時態變化
被動語態通常為十種時態的被動形式, 被動語態由be+過去分詞構成，be隨時態的變化而變化。以do為例，各種時態的被動語態形式為：
1) am/is/are +done (過去分詞) 一般現在時
例Visitors are requested not totouch the exhibits.
2) has /have been done 現在完成時
例All the preparations for thetask have been completed, and we're ready to start.
3) am/is /are being done 現在進行時
例A new cinema is being builthere.
4) was/were done 一般過去時
例I was given ten minutes todecide whether I should reject the offer.
5) had been done 過去完成時
例 By the end of last year,another new gymnasium had been completed in Beijing.
6) was/were being done 過去進行時
例A meeting was being held when Iwas there.
7) shall/will be done 一般將來時
例Hundreds of jobs will be lostif the factory closes.
8) should/would be done 過去將來時
例The news would be sent to thesoldier's mother as soon as it arrived.
9) shall/will have been done 將來完成時(少用)
例The project will have beencompleted before July.
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