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例如: All the people laughed at him. → He was laughed at by all people. They make the bikes in the factory. → The bikes are made by them in the factory. He cut down a tree. → A tree was cut down by him. (五)含有情態(tài)動詞的被動語態(tài) 含有情態(tài)動詞的主動句變成被動句時,由“情態(tài)動詞+ be+過去分詞”構(gòu)成 We can repair this watch in two days.→ This watch can be repaired in two days. They should do it at once.→It should be done at once. 用所給動詞的正確形式填空 . 1. English ________ (speak) in many countries. 2. Information in shortterm memory ________ (can, not, keep) very long. 3. After that, one of the lights _______ (turn off) and the rat had to wait for a short time. 4. Just a few years ago, tomatoes _______ (believe) to have magical powers, making people who ate them fall in love. 5. It is said new copies of the book _______ (print) now. 6. The old house ______