2016年职称英语卫生类语法辅导：复合句

1.陈述部分用had better +原形动词表示建议时，问句部分用hadn't +主语形式。

①You'd better tell him about the matter,hadn't you?

②We had better do it by ourselves,hadn't we?

2.陈述部分用used to +主语时，问句部分用didn't + 主语？或usedn't +主语形式。

①He used to live in the country,didn't he?/usedn't he?

②They used to be good friends,didn't they?/usedn't they?

3.陈述部分用must(may,might) + have + V-ed表示推测时，若句中带有明显的过去时间的状语，问句部分动词用过去时形式。如：

①He might have forgotten his pen in the classroom yesterday,didn't he?（不用mightn't he?/hasn't he?）

②You must have got up late this morning,didn't you?（不用mustn't you?/haven't you?）

4.陈述部分用must(may,might) + have + V-ed表示推测时，若句中没有带明显的过去时间的状语，问句部分动词用现在完成时形式。如：

①Everyone must have known the death of the waitress,haven't they? （不用mustn't they?）

②You must have worked there a year ago,didn't you?（不用mustn't you?/ haven't you?）

5.陈述部分的主语为从句时，问句部分的主语一般用it代替，如：

①What he said is true,isn't it? （不用didn't he?）

②Where we will build the dam has not been decided yet,has it? （不用won't we?）

6.陈述部分的主语为动名词或不定式时，问句的主语用it代替。如：

①To do one good deed is easy for a person,isn't it?

②Skating is your favorite sport,isn't it?

7.陈述部分的主语是不定代词one，反义疑问句的主语可以用one，也可以用you。如：One should be ready to help others,shuldn't one?