學(xué)習(xí)被動語態(tài)時，不僅要知道被動語態(tài)的各種語法結(jié)構(gòu)，還要知道在哪些情況中使用被動語態(tài)。

1. 講話者不知道動作的執(zhí)行者或不必說出動作的執(zhí)行者 (這時可省 by 短語)。

例 My bike was stolen last night.

2. 借助被動的動作突出動作的執(zhí)行者。

例 I was given ten minutes todecide whether I should accept the offer.

3. 為了更好地安排句子。

例The well-known person got onthe bus and was immediately recognized by people. (一個主語就夠了)

It is said that+從句及其他類似句型

一些表示“據(jù)說”或“相信”的動詞如believe, consider, expect,report, say, suppose, think等可以用于句型“It+be+過去分詞+that從句”或“主語+be+過去分詞+to do sth.”。有：It is said that… 據(jù)說,It is reported that…據(jù)報道，It is believed that…大家相信，It is hoped that…大家希望，It is well known that…眾所周知，It is thought that…大家認(rèn)為，It is suggested that…據(jù)建議。

例 It is said that the boy haspassed the national exam. (=The boy is said to have passed the national exam. )

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