④情态动词和be going to、be to、be sure to、used to、have to、had better等结构变被动语态, 只需将它们后面的动词原形变为be +过去分词.
⑤当句子的谓语为say、believe、expect、think、know、write、consider、report等时,被动语态有两种形式:谓语动词用被动语态,动词不定式作主补.用it作形式主语,真正的主语在后面用主语在后面用主语从句来表示.如:
People say he is a smart boy.
It is said that he is a smart boy.
He is said to be a smart boy.
People know paper was made in China first.
It is known that paper was made in China first.
Paper was known to be made in China first.
类似句型有:It is said / known / suggested / believed / hoped/ thought that
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