【摘要】：换个说法，有一件事情不知道是谁干的或者不想说出是谁干的，这时就用被动语态。These fighters are imported from Russia. 这些战斗机是从俄国进口的。That place has been turned into a swimming pool. 那个地方已被变成游泳池。
1、不知道或没有必要指出动作的执行者。换个说法，有一件事情不知道是谁干的或者不想说出是谁干的，这时就用被动语态。例如：
I felt a littlie nervous when I was being interviewed. 我接受面试的时候，有点紧张。
These fighters are imported from Russia. 这些战斗机是从俄国进口的。
That place has been turned into a swimming pool. 那个地方已被变成游泳池。
2、说话或发表意见时，为了显得客观公正，也常用被动语态
He’s said/believed/reported to be in the U. S. A. 据说/据信/据报道他在美国。
还有下列常用句型(that 后面跟句子)：
It is said that……. 据说
It is reported that……. 据报道
It is hoped that……. 希望
It is believed that……. 人们相信
It is announced that……. 据宣布
it is (well) known that……. 众所周知
It has been decided that……. 已经决定
It is supposed that……. 人们认为
It is suggested that……. 有人建议
It must be remembered that……. 务必记住
It is taken for granted that……. 被视为当然
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