题目内容
17.I can't sleep well before a big exam.What ____I do?( )| A. | should | B. | might | C. | must | D. | D |
分析 大考前我睡不好,我该怎么做?
解答 答案:A.结合上文I can't sleep well before a big exam可知是说睡不好,故可知是表达应该怎么做,故用should应该,might可能,must必须,故选A.
点评 情态动词无人称和数的变化,情态动词后面跟的动词须用原形,否定式构成是在情态动词后面加"not".个别情态动词有现在式和过去式两种形式,过去式用来表达更加客气,委婉的语气,时态性不强,可用于过去,现在或将来.情态动词属非及物动词,故没有被动语态.
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