高中英语语法——祈使句PPT 课件

Turn right.
Don’t walk. / No
Don’t turn left.
Don’t stop. / No
than 90
pedestrians. / No left parking
kph.
turn.
They give instructions
一.祈使句的定义
定义: 用于表达命令、请求、劝告、警告、
What is different now?
Do be patient! Do sit down. Do write back when you receive his letter. Tom, you clean the room. Don’t you be late again next time!
以let’s 开头的祈使句用shall we, 以let us开头的祈使句用 will you, 构成反意 疑问句。
9.________, I think, and the problem could be settled. A. If you don’t doubt your efforts B. As you keep up your spirits C. Making great efforts D. A bit more efforts
1.加强祈使句语气的方式:
Do / you+动词原形
2.祈使句(,) +and / or+ 简单句
是一种固定句式。
此句型为“条件与结果”并存的句式，其 中的祈使句可转化为if条件句。
e.g. Work hard and you will succeed. = If you work hard, you will succeed. Hurry up, or you will miss the last bus. = If you don’t hurry up, you will miss the last bus.
Let me help you.
◆ 否定结构: ① Do型和Be型的否定式都是在句首加don’t构成。
如:不要忘记我!
Don’t forget me! /Don’t be late! ② Let型的否定式有两种:“Don’t + let + 宾语 +
动词原形 + 其它成分”和“Let + 宾语 + not + 动 词原形 + 其它成分”。如:别让他走。
2. Conclusion
◆ 肯定结构:
➢ Do 型 （以行为动词开头） Stand up! Don’t stand up! / Never stand up!
➢ Be 型 （以be动词开头） Be careful. Don’t be late./ Never be late.
➢ Let型 （以let开头） Let him in.
He is always sleeping in the class. (×)
It’s a beautiful day, isn’t it? (×)
Tell me your name, please? (√)
Will he come tonight? (×)
Mary, come here!
(√)
二.祈使句的结构
A. do you
B. needn’t you
C. won’t you
D. will you
否定祈使句的反意疑问句用will 构成。
8. Let’s have a cup of tea, ________?
A. shall you
B. will you
C. shall we
D. won’t you
1. _G_o___ on the pavement （人行道）. 2. _R_id_e__ in the bicycle lanes. 3. S_t_o_p___ at red traffic lights. 4. _K_e_e_p__ the rules of the road.
go, keep, look, ride, stop, stay, watch out
1. Observation What’re the features of imperative?
Listen to me carefully.
Come in and ssiittdown, please. Don’’tt close the window – it’s hot. Be quiet! BBeea good boy! Let’s try our best to improve our environment.
A. shan’t we B. shall we
C. won’t we D. will you
4. Wait a minute, ______?
A. shall you B. will you
பைடு நூலகம்
C. do you
D. don’t you
5. ___ down the radio—the baby’s asleep in the next room. A. Turning B. Turned C. Turn D. To turn
--- ___A___ David go. A. just watch B. just to watch C. just watching D. just having watched
Grammar-6. Practice (3ms)
4. --- Don't forget to my birthday party tomorrow. --- ___B_____ . A. Yes , I won’t B. No , I won’t C. No , I will D. Yes， I will
禁止等的句子叫做祈使句。
Look at the following sentences:
Go and wash your hands. （去洗手。——命令） Be quiet, please.（请安静。——请求） Be kind to our sister. （对姊妹要和善。——劝告） Look out！Danger！（小心！危险！—警告） Keep off the grass. （勿践草坪。——禁止）
4. 祈使句+波折号+附加信 息；附加信息常表示发出祈使动
作的原因。
e.g. Put on your coat, please—it’s very cold outside.
Turn down the TV set—the baby is asleep in the room.
走近高考：
1. Stand over there ___ you’ll be able to see it
A. Know B. Knowing C. To know D. Known 2． Stand over there ____D___ you’ll be able to see
it better. A. or B. while C. but D. and 3.---I’ve never seen anyone run so fast.
5.W__a_tc_h__o_u_t_ for pedestrians （行人）. 6. _L_o_o_k__ behind you before you turn
right or left. 7. _D_o_n_’_t_s_ta_y__ in the middle of the road.
三.祈使句中应注意的 几个问题
这一句式也可以演变为“名词 性短语+and+简单句”的形式。
More time, and I could have done it better. 如果多给我一些时间，我可以做得更好。
3.祈使句的附加疑问句
Opennthe door, _w__il_l _y_o_u_?__/（__w__o_n_’_t _y_o?u） DDon’ttforget, _____w_i_ll_y_o_u_______? Lettuussgo there, __w__ill_y_o__u______? Lett’’ssgo there at once, __s_h__a_ll_w__e_?
Don’t let him go. / Let him not go.
③ 有些可用no开头, 用来表示禁止性的祈使句。 如:禁止吸烟！禁止钓鱼！
No smoking!
No fishing!
用祈使句完成下列句子。
go, keep, look, ride, stop, stay, watch out
Can you tell me what are imperatives?
祈使句无_主__语__，主语you常_省__去___；
动词_原__形__谓语当，句首加_D_o_n_’t_变否定；
Are the following sentences imperative? (discuss in pairs)
better.
A. or B. while C. but D. and
2. ________ remember to turn off
the lights before you leave the lab.
A. Be sure
B. Do
C. Make sure D. Does
3. Let us pass, _______?
10. It’s really very dangerous. One
more step, ______the baby will
fall into the well.
A. or
B. so that