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专题 11 情态动词
常见的表示推测的情态动词：must, can,could, may, might, may not, can’t
这种题型在判断时一般要根据上下文来判断可能性大小，从而选择合适的情态动词。
1) 表示肯定推测时，可能性：must一定>can可能>may也许>might也许，表示对现在
发生的事的推测
例如：It is 9:00 p.m. She must be at home. 晚上九点了。她现在一定在家。注意：must
只用于肯定句
如果表示“一定不”，用can’t：She can’t be at home. 她一定不在家。
He likes reading. He could read his favorite book. 他喜欢读书。他可能在读他最喜欢的书。
The boy finished his homework. He may play in the garden. 那个男孩写完了作业。也许在
花园里玩。
Mary doesn't tell anyone where she is. She might go shopping. 玛丽没告诉任何人她在哪。
她可能去购物了。
2) could表示推测可用于肯定句也可用于否定句，表示可能性不大的推测。
例如：The plane could be delayed by fog. 飞机可能因为大雾晚点。（有一定根据但不确
定，大雾可能不会有那么大影响）
He couldn't come because he has a cold. 因为他感冒了可能来不了。（没有强调是重感冒，
不能断定一定来不了）
3) may might “ ” “ ” might
和 表推测可能性比较小，意思是 可能 、 也许 ，（注： 不表示过去
may
时态，只是语气上比 更委婉，表示的可能性更小），可用于肯定句也可用于否定
句
He may/might be American.
例如： 他可能是美国人。
He may/might not be at school.
他可能不在学校。
这两个一般不会放在同一道选择题中，如果出现的话，强调了可能性很小或表示委婉
might
才用
4) can can’t “ ” “ ”
表示推测用于否定句（常写成 意思是 肯定不 ， 不可能 ）
He can't be Jack. He has just gone abroad.
他不可能是杰克。他刚出国。
一．选择题（共15小题）1．—Lucy is walking the dog in the park.
—It__________be her.Listen!She is singing loudly in her room.（ ）
A．mustn't B．needn't C．won't D．can't
2．I saw Miss Li in the school library five minutes ago，she ______ be in her office now.
（ ）
A．may B．must C．mustn't D．can't
3．—Whose cap is it？Is it Cindy's？
—It _________ be hers.Don't you remember she didn't even come to the party？（ ）
A．mustn't B．can't C．needn't
4．—Whose pencil case is this？
—It ________ be Helen's.It seems she has one like this，but I can't remember clearly.（ ）
A．must B．might C．can't
5．﹣ Do you know where Linda is？
﹣ She _______ be in the school library，but I'm not sure.（ ）
A．must B．should C．may
6．﹣﹣ Let's go to Lily's home to visit her tomorrow .
﹣﹣ Good idea !But we had better call her first .She be at home .（ ）
A．needn't B．may not C．mustn't D．can 't
7．﹣The boy under the tree be Tom.
﹣No，it be Tom.I saw him enter the teachers' office just now.（ ）
A．may；needn't B．can；mustn't
C．must；can't
8．﹣﹣﹣ Lily，is this suitcase yours？
﹣﹣﹣ No，it isn't.It ________ be Mary's.Look，there's her name on it.（ ）
A．must B．might C．mustn't D．can't
9．—There is a knock at the door.
—It _____ be my father.He always comes back at this time.（ ）
A．can't B．must C．may D．may not
10．You______be tired after the whole day's work.（ ）
A．must B．should C．can D．would
11．﹣﹣﹣Lisa!There _______ be four forks on the table，not six!
﹣﹣﹣Oh!Only four of us for supper today？（ ）A．can B．should C．must D．might
12．— Only fifty﹣one books？There ________ be fifty﹣three.
— Oh，Mr.Zhang took two away yesterday.（ ）
A．should B．must C．can D．may
13．— Let's go to Zhaolin Park by taxi.
— It's not far.We______ take a taxi.（ ）
A．mustn't B．can't C．needn't
14．﹣You_____be excited ﹣﹣ you have tickets for your favourite band!
﹣Yes.It's unbelievable that I can see the band play live!（ ）
A．need B．have to C．must D．might
15．—Look!It must be David in the classroom.
—It ________ be him.Because I saw him in the library a moment ago.（ ）
A．mustn't B．may C．can't D．can
