emy troups were forced to surrender.
前句的谓语是there be,后边的疑问部分也用there be形式。例如：
There is a radio on the table,isn't there? Yes,there is.
前句的谓语动词为 have to /had to 时,其疑问部分的谓语动词通常用do 的适当形式。例如:We have to get up at four tomorrow, don't we?
They had to leave early, didn't they?
前句的谓语动词为used to 时,其疑问部分的谓语动词可采取两种形式。
例如:He used to live in London, use(d)n't he /didn't he?
There used to be a cinema here before the war, use(d)n't there /didn't there?
前句的谓语动词是ought to, 则疑问部分的谓语动词通常用ought /oughtn't 代替。例如:Such things ought not to be allowed, ought they?
He ought to be punished, oughtn't he?
但在正式文体中,用ought we not形式。例如:
We ought to go, ought we not?或We ought to go ,should we not?
当陈述部分有dare 或need 时,若dare 和need为实义动词,疑问部分的谓语用do 的适当形式;若dare 和need 为情态动词,疑问部分用dare 或need 构成。例如:We need to do it, don't we? You daren't go there, dare you?
含有情态动词must的句子表示推则,作“想必”解时,疑问部分要根据must后面的不定式结构的时态来确定,不可用mustn't。若前句强调对现在情况的推测,疑问部分用aren't(isn't)十主语,例如：You must be tired,aren't you?
注意:若陈述部分的must表示“有必要”时,附加疑问句部分则用needn't。
例如：You must go home right now, needn't you?
当mustn't 表示禁止时,附加疑问部分一般用must。如：
You mustn't walk on grass, must you?
前句谓语动词是must have＋过去分词时,若前句强调对过去情况的推测(一般有过去时间状语),疑问部分的谓语动词用didn't＋主语;若前句强调动作的完成,疑问部分的谓语动词用haven't(hasn't)＋主语, 例如：
He must have met her yes

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