摘要:要求一定时态的固定的句型 ①was/were doing sth. when-did sth.(正在做某事.这时突然--) I was reading a book when the bell rang. ②was/were about to do sth. when-did sth. (正要做某事.这时突然--) We were about to leave when the telephone rang. ③It the first/second/third-time+ that- It’s the first time I’ve seen her. We have been there three times. 如果句中有比较确定的时间状语.则服从时间状语的要求. Last year I saw him many times. ④It is/has been- since- It is two weeks since I came here. She said it was five hours since she had finished her work. ⑤Hardly- when-\No sooner- than- Hardly had we got in the crops when it began to rain. I had no sooner come into the room than the door was closed. ⑥It the first/second/third-time+ that- This is the first time I have been here. It'll be the first time I've spoken in public. III.被动语态的用法 被动语态表示句子的主语是动作的承受者.也就是动作的对象.一般说来只有及物动词才有被动语态.其构成为"be+及物动词的过去分词".助动词be有人称.数和时态的变化.其变化规则与be作为连系动词时完全一样.含有情态动词的谓语变化为被动语态时.由"情态动词(can, may must, have to等)+be +动词的-ed形式.含有"be going to , be to, used to, be about to"等结构的复合谓语变为被动语态时.其构成为"be going to (be to, used to, be about to)+ be +动词的-ed形式"构成.

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