作业帮must 加动词形式表猜测 的用法
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must 加动词形式表猜测 的用法
must 加动词形式表猜测 的用法
must 加动词形式表猜测 的用法
must后可接三种形式表推测,
第一种must be +形容词／名词／介词短语等,表示对现在的状态或所在的方位等的推测．如：The man who sings this song must be very young.
I saw Tom went in the direction of the library just now.He must be in the library now.
第二种 must be doing sth.表示对现在正在干的动作进行的推测,译为肯定正在干－－－
如： He must be reading in the library.
第三种 must have done 这个结构表示对过去的情况的很有把握的推测．如：The ground is wet.It must have rained last night.
值得一提的是如果must 表示推测,它变反意疑问句时要先去掉它再看该用什么时态,再用对应的时态反问．如上面的例句．The man who sings this song must be very young.去掉情态动词应为The man who sings this song is very young.所以反问用isn't he?
It must have rained last night.去掉情态动词是It rained last night.再进行反问,则为It must have rained last night,didn't it?
设想下这句 It must have rained ．应该如何变反间疑问句呢?聪明的,你肯定会．
It must have rained--It has rained----------It must have rained,hasn't it?
一切解释及例子等皆为原创,如有问题,欢迎追问．这个地方我明白,
后接动词原形，must表示猜测时是be certain or probable to的意思。so...