The machine must be operated with care. 这机器必须小心操作。
Such a sentence ought not to be used here. 这个句子不应该用在这里。
What's done cannot be undone.
覆水难收。
People had to be reminded of the danger that night. 那天晚上必须提醒人们当心危险。
E. 含有“be going to do”和“be to do”等结构的主动句变被动句
含有“be going to do和 be to do 等结构的谓语动词,变成被动语态时,分别用“be going to + be done”和“be to + be done”。在这两种结构中,be只有一般现在时和一般过去时两种形式。
The problem is going to be discussed at the meeting. 这个问题将在会上讨论。
This new film is to be shown on TV next week. 这部新片下周将在电视上放映。
F.含有宾语从句的主动句变被动句
带有宾语从句的句子变成被动语态时,通常用it来作为被动句的形式主语,宾语从句保留不变。
They said that he had gone abroad to study English. 他们说他出国学英语去了。
-- It was said that he had gone abroad to study English. 据说他出国学英语去了。
We haven't decided when we should go camping. 我们还未决定什么时候去野营。
-- It hasn't been decided when we should go camping. 什么时候去野营尚未决定。
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