又见“祈使句” 一、定义：
用于表达命令、请求、劝告、警告、禁止等的句子叫做祈使句。
二、祈使句句式：肯定结构：
1. be型（即：系动词原形be＋表语＋其它）。
eg. be careful! don't go too high. 当心！别爬得太高。
be quiet, everyone! 大家请安静！
2. do型（即：行为动词＋宾语＋其它）。
eg. come in, please! 请进来！
please open your books! 请翻开书！
型（即：let＋宾语＋动词原形＋其它）。
eg. let me h**e a look.让我看一看吧。
let me help you.我来帮你吧。
●否定结构：
祈使句的否定式多以do not（通常缩写为don't）引起，也可用never引起。
1. be型（即：don't＋be＋表语）。
eg. don't be lazy! 不要懒惰！
never be late again. 千万不要再迟到了。
2. do型（即：don't＋行为动词原形＋其它）。
eg. don't throw the ball like that.不要那样扔球。
don't worry. i'll soon be all right. 你们不要担心，我很快就会好的。
never do it like that.千万不要那样做了。
3. let型有两种否定形式：
①let＋宾语＋not＋动词原形＋其它。
eg. let him not go there.别让他去那儿。
let's not waste time.咱们不要浪费时间了。
②don't＋let＋宾语＋动词原形＋其它。
eg. don't let her go there.别让她去那儿。
don't let the water run into the room.别让水流进房间。
另外，有些可用no开头，用来表示禁止性的祈使句。
eg. no smoking! 禁止吸烟！
no fishing! 禁止钓鱼！
五、祈使句专项练习。
（一）用括号内所给动词的适当形式填空。
1. it's an important meetingnot, be )late.
2not, make) any noise! your mother is sleeping.
3not, speak) with your mouth full of food.
4not, talk) andread) aloud.
5not, le**e) your homework for tomorrow, larry.
6look) out! a car is coming.
7not, let) the baby cry.
8. let'snot, say) anything about it.
（二）选择最佳答案填空。
1. if you are tired, _a rest.
a. h**e b. h**ing c. to h**e d. had
2. _me go. it is very important for me.
a. do let b. let do c. doing let d. to do let
3. he is not honest. _believe him.
a. not b. don't c. to not d. not to
4. if you want to stay, let me know, _
a. will you b. shall we c. do you d. do we
5. never come late again, _
a. will you b. won't c. do you d. does he
6. _up early tomorrow, or you can't catch the train.
a. getting b. get c. to get d. got
7. _in the street. it's dangerous.
a. not play b. not to play c. don't play d. don't to play、
8. please __me some money, will you?
a. lend b. lending c. to lend d. be lend
9. the film is about to begin. please __seated.
a. be b. are c. is d. being
10. _the boxes. you may use them later.
a. keep b. keeping c. to keep d. kept
11.＿＿straight on and you'll see a church. you won't miss it.
a. go b. going c. if you go d. when going
12.__at the door before entering please.
a. knocked b. to knock c. knocking d. knock
1. don't be 2. don't make 3. don't speak 4. don't talk, read
5. don't le**e 6. look 7. don't let 8. not say
（二）选择最佳答案填空。
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