祈使句的用法及练习

祈使句的用法及练习
一、含义
用来表示请求、命令、劝说、叮嘱等的句子就是祈使句。

祈使句一般以动词原形开头。

二、形态
（一）Be型(be+adj)
Be careful!
Be dangerous!
Be quiet!
（二）Do型(Do代表动词原形)
Open the door!
Close the window!
Go and play football!
（三）Let's或Let us型
Let's go home!
Let us help Mary!
Let me clean the room!
（四）No+动名词，多用在标语禁令中
No smoking!
No parking!
No spitting!
No+动名词可以与Don't+动词原形替换。

No smoking!=Don't smoke!
三、否定形式
Be型和Do型前直接加Don't，
Let's型可前面直接加Don't或let's后加not。

Don't be careful!
Don't open the door!
Don't let's go home!/Let's not go home!
四、反意疑问句
祈使句的反意疑问句一般用will you?
Let's---用shall we?
Let us---用will you?
Open the door,will you?
Let's go home,shall we?
Let us help Mary,will you?
五、练习题
（一）用括号内所给词的适当形式填空
1． It's an important meeting.______ (not be) late.
2．_____ (look) out!A car is coming!
3．________ (not make) any noise! The baby is sleeping.
4．Let's _______(not say) anything about it.
5．________ (not let) the baby cry.
6．_____ (read) aloud,please.
7．_________ (not talk) with your classmate in the class.
（二）选择题
1．Her doctor said:"____ work so hard"
A stop
B Don't
C can't
D No
2．Sindy,____ to be here at 8 o'clock.
A is sure
B is sure that
C will be sure
D be sure 3．_____ him the secret,will you?
A Don't tell
B Not to tell
C Not telling
D No telling 4．Please _____ look outside,look at the blackboard.
A not
B don't
C aren't
D can't 5．John,read the text for us,_____ ?
A does he
B will he
C do you
D will you 6．Let's do it at once,_____ ?
A shall we
B will you
C do we
D do you 7．Let us do it at once,____ ?
A shall we
B will you
C do we
D do you 8．_____ in bed, It's bad for your eyes.
A Not to read
B Don't read
C Don't to read
D Not read 9．____ smoking!
A Don't
B No
C Don't to
D Be not。