Question

几道英语选择题求助

1.---Frank isn't in the house now.
---____ left by the back door?
A.Had he B.Must he have C.Should he have D.Could he have
2.I'm sorry ,but I must say his English still___.
A.need to be improved B.needs to improve C.needs to be improving D.needs improving
3.You'll like rhe new school.It ___ be a little small,I think ,but you'll get used to it soon.
A.could B.must C.shall D.should
4.When three pwople travel with me,there____ someone who ____be my teacher.
A.must have ,might B.must be,can C.may be,could D.may have ,may
5.---Mike must have known that.
----No,he ___.How ____ he?
A.mustn't,must B.may not,may C.couldn't，could D.needn't ,need
6.---Where's the knife?
---It ____ on the plate.I put it there just now.
A.could be B.may be C.would be D.should be
7.When she study at university,she ____ stay up very late,reading novels.
A.must B.could C.might D.would
8.The traffic signs show clearly that people ____ faster than speed limit.
A.do not drive B.will not drive C.may not drive D.might not drive
麻烦原因说的详细些，谢了

Answer 1

A D B D D D C D
这几题主要考的是情态动词

2 1 情态动词表示推测的用法
情态动词must，can，could，may，might都可用来表示推测

1．must所表示的可能性最大，最有把握，意为“一定”。
2．can和could主要用于否定句和疑问句中 ，can’t或couldn’t 表示“不可能”
3．may 和 might表示现在或将来可能发生的动作或情况，主要用于肯定句中，might相对于may 来说，
表示的可能性更小一些。
Tip:1).表示猜测，can/could一般不用于肯定句中，除非是“经验之谈”。
如： Anybody can make mistakes.
2)．may和might都不用于疑问句中。
如：（正）Can ／Could it be cloudy tomorrow ？
（误）May ／Might it be cloudy tomorrow ？
4、should也可以用来表示“推测”，意为“可能；该”,
相当于be expected to。往往指具有一定的客观根据
或根据推理对现在某事发生的“可能性”进行描述，
语气上不如must强。
5、情态动词表示猜测时语气从强到弱的顺序是：must，should，can，may，could，might。

Answer 2

A D B D D D C D
你要理解“may” “might”"could" "must" "would"的意思，并根据句意从而选择