情态动词课件.ppt

表示推测——情态动词的重要用法.
情态动词
对将来
肯定的推测
+ V.
must 常见must be
对现在
对过去
+ V.
+ have done
+ be doing
可能的推测
may, might
否定的推测
can’t, couldn’t
疑问的推测
can, could
+ V.
+ V.
+ have done
+ be doing
语法讲义之
情态动词 modal verbs
向永平
1.--Is John coming by train?
--He should, but he ____ not. He likes driving
his car.
(2002高考题）
A. must B. can C. need D. may
2.It has been announced that candidates(候选人)
No, ____yo__u_n_e_e_d_n_’_t___. No, __y_o_u_d_o_n_’_t_h_a_v_e__to_.
needn’t 对其它情态动词的回答:
--Shall I tell John about it? --No, you __n_e_e_d_n_’_t__.
(don’t have to)
--Must we do it now? --No, you __n_e_e_d_n_’_t__.
(don’t have to)
表示推测——情态动词的重要用法.
1. You must be Mr Smith----I was told to expect you here.
2. He must have known what we wanted. 3. We may have read the same report. 4. He can’t have slept through all that noise. 5. There’s someone outside----who can it be? 6. What can they be doing? 7. These pills might help to cure your disease. 8. You could be right, I suppose.
These dishes need be cleaned carefully. These dishes need to be cleaned carefully. These dishes need cleaning carefully.
注意对need问句的回答:
--Need I finish the work today? --Yes, ____y_o_u_m__u_s_t_____.
He daren’t to speak English before such a crowd, did he?
He daren’t speak English before such a crowd, dare he?
Nobody need to be afraid of catching the disease. Nobody need be afraid of catching the disease.
winter.
(2002北京高考题）
--It ____ true because there was little snow there.
wk.baidu.com
A. may not be
B. won’t be
C. couldn’t be
D. mustn’t be
can could may might shall should must will would ought to have to dare (daren’t) need (needn’t) used to
____ remain in their seats until all the papers
have been collected.
(2002上海高考题）
A. can B.will C. may D. shall
3.--I heard they went skiing in the mountains last
可兼做行为动词的情态动词：need 、 dare
情态动词 (+动词原形)
行为动词
1.无人称和数的变化; need 2.尤其用于：
*否定句及疑问句中;
多用于肯定句;
(sb.) need to do
*在if/whether之后; .
dare to do
*或与hardly, never, (sth.) need to be
dare
no one, nobody连用;
done
3.常以needn’t 和daren’t(sth.) need
doing
的形式出现;
4.dare有其过去时dared.
判断正误: How dare you say such a thing?
How dare you to say such a thing?
可以用not表示“可能不”
+V.
+ V.
+ have done
+ be doing
+ V.
+ V.
+ have done
+ be doing
1. I don't know where she is, she __m_a_y___ be in Wuhan. 2. At this moment, our teacher _m__u_st__b_e_m__a_r_k_in_g__ our exam papers. 这时，我们老师想必在批改试卷。 3. The road is wet. It _m__u_s_t _h_a_v_e_r_a_i_n_e_d_ last night.
情态动词
表示推测 不表示推测
I daren’t ask her for a rise. 我不敢请求她加薪. How did you dare to tell her that? I wonder whether he dare stand up in public. I don’t know how she dares to wear that dress. Do you need any help? I wonder whether he need send it immediately. I need hardly tell you that the work is dangerous. The garden doesn’t need watering at the moment. You needn’t finish that work today.