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2、主动语态变为被动语态时应注意的几个问题。
(1)如果主语是疑问代词，变被动语时要加介词by.
主：Who cleaned the windows?
被：Who was the window cleaned by?
(2)如果主语不是动作的执行者，而是表示“所使用的物质材料”的名词，变为被动语态时，表示“物质材料”的名词前要加介词with.
主：Smoke filled the room.
被：The room was filled with smoke.
(3)如果句子中含有双宾语，变为被动语态时可以将其中任何一个宾语变为主语，另一个不变，但是将直接宾语变为主语时，要在间接宾语前加介词to.
主：She gave me an English book.
被：I was given an English book.(by her)或An English book was given to me(by her).
(4)在含有make/see/hear/watch/notice等感官动词或使役动词作谓语的主动语态句子中，动词不定式在这些动词后面作宾语时，常省略不定式符号to,但变为被动语态时，to不能省略(let除外)。
主：The teacher let me have a rest.
被：I was let have a rest by the teacher.
(5)如果宾语有短语或从句修饰，变为被动语态时，修饰成分应与宾语一同提前。
主：We clean the windows of our classroom once a week.
被：The windows of our classroom are cleaned once a week.
(6)如果宾语是从句，变为被动语态时，一般用it作形式主语，并放在句首。而宾语从句则变为主语从句，并放在句子的最后。
主：Mary said that she would come to see you.
被：It was said that Mary would come to see you.
(7)表示静态的及物动词have/cost/hold/know/fit等作谓语时，主动词不能变为被动句。
例：He has a new pen.
(8)look/become/get/turn等作系动词用时，主动句不能变为被动句。
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