初中英語知識點大全?那么,初中英語知識點大全?一起來了解一下吧。
構成形式
基本時態變化:被動語態由be + 過去分詞構成,be 隨時態變化而變化,通常有十種時態的被動形式。例如:| 時態 | 結構 | 例句 || --- | --- | --- || 一般現在時 | am/is/are + done(過去分詞) | Visitors are requested not to touch the exhibits. || 現在完成時 | has/have been done | All the preparations for the task have been completed, and we're ready to start. || 現在進行時 | am/is/are being done | A new cinema is being built here. || 一般過去時 | was/were done | - || 過去完成時 | had been done | By the end of last year, another new gymnasium had been completed in Beijing. || 過去進行時 | was/were being done | A meeting was being held when I was there. || 一般將來時 | shall/will be done | Hundreds of jobs will be lost if the factory closes. || 過去將來時 | should/would be done | The news would be sent to the soldier's mother as soon as it arrived. || 將來完成時(少用) | shall/will have been done | The project will have been completed before July. |
特殊結構形式
帶情態動詞的被動結構:情態動詞 + be + 過去分詞。例:The baby should be taken good care of by the baby - sitter.
雙賓語變被動:有些動詞有兩個賓語,變被動時可把主動結構中的一個賓語變為主語,另一賓語保留在謂語后,通常變為主語的是間接賓語。例:His mother gave him a present for his birthday. 可改為 He was given a present by his mother for his birthday.
賓語補足語結構變被動:當動詞 + 賓語 + 賓語補足語結構變為被動語態時,將賓語變為被動結構中的主語,其余不動。例:Someone caught the boy smoking a cigarette. 可改為 The boy was caught smoking a cigarette.
動詞詞組的被動:有些相當于及物動詞的動詞詞組,如動詞 + 介詞,動詞 + 副詞等,也可用于被動結構,但要把它們看作一個整體,其中的介詞或副詞不能省略。例:The meeting is to be put off till Friday.
非謂語動詞的被動語態:v + ing 形式及不定式 to do 也有被動語態(一般時態和完成時態)。
使用情況
講話者不知道動作的執行者或不必說出動作的執行者(這時可省 by 短語)。
借助被動的動作突出動作的執行者。
為了更好地安排句子。例:The well - known person got on the bus and was immediately recognized by people.(一個主語就夠了)
相關句型:一些表示據說或相信的動詞如 believe,consider,expect,report,say,suppose,think 等
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