浙江省高中英语人教版必修三：Unit2 Grammar情态动词2(共18张PPT)
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①There’s plenty of time. We needn’t drive so fast. ②Need I do it all at once? [注意]由于need用作情态动词时通常不用于肯定句，所以由
need开头的疑问句的肯定回答用must/have to, 否定回答则用needn’t。 --Need I hand in my paper now? --Yes, you m_u_s_t_/_h_a_v_e__to_./ No, you _ne_e_d_n_’t__.
[注意]ought to的否定形式为ought not to(oughtn’t to), 一般疑问形式是将ought提至句首，其否定答语通常 用don’t have to或needn’t(与must同)。
①--_O_u_g_h_t _ he to see the doctor? --Yes, he _o_ug_h_t__to_. No, he n_e_e_d_n_’t_/_d_oe_s_n_’t__h_av_e__t_o.
give you some punishment. ③_D_a_r_e_y_o_u_a_s_k_him personally?你敢当面问他吗？ ④_H_o_w__d_a_r_e_y_o_u_a_s_k_me such a question?你怎么敢问我这
个问题？
dare
2. dare作实义动词时，在否定句中不定式符号to也可以省略。 ①The children _d_o_n’_t_d_a_r_e_(_t_o_) _/_d_a_re__n_o_t _(不敢) make a
need
(2012天津) It’s quite warm here; we __C__ turn the heating on yet. A. couldn’t B. mustn’t C. needn’t D. wouldn’t
need
2.need用作实义动词，有时态、人称、数的变化，可用于一 切句式，其宾语可以是名词、代词、动名词或动词不定式。 构成否定句和疑问句时要借助于助动词do。
have to
1. have to意为“不得不”，侧重客观需要，有时态、人称 和数的变化；must强调说话人的主观看法。 ①He _h_a_s_t_o_(不得不) leave now. ②I _h_a_d_t_o_(不得不) leave yesterday. ③We w_o_n_’t__h_a_ve__t_o_(没有必要)start next week.
2. have to的否定式和疑问式需要借助助动词do。 ①_D_o__y_o_u_h_a_v_e_t_o__(你必须)tell him about that? ②They _do_n_’t__h_a_v_e_t_o_(没有必要)buy a computer now.
[注意]don’t have to常可以回答must提问的一般疑问句，而 must的否定式mustn’t表示“禁止”。 ①You m__u_st_n_’t_ come here without permission.
①He _n_e_e_d_s our help. ②这辆自行车需要修理。
The bike needs__re_p_a_ir_i_n_g/__t_o_b_e__re_p_a_i_re_d_. The bike needs/wants/requires repairing/ to be repaired. ③我们没有必要告诉他真相。
sound while their parents are sleeping.
“情态动词+have done”表猜测
1. must have done表示对过去发生的事情进行肯定的推测， 意为“想必/肯定/准是已经...”，只用于肯定句中。
The ground is rather wet, so it _m__u_st__h_a_ve__r_a_in_e_d_(rain) last night. [注意]此时它的否定式为can’t/ couldn’t have done,表示对过
②You _o_ug_h_t__no_t__t_o_(不应该)make this kind of mistake again.
ought to
2. 表示可能性，一般指较大的可能性，意为“按道理应该”, 与should同。
① They ought to win—they’ve trained hard enough. ② If he started at six, he ought to be here now. 3. 在反意疑问句中，下面两种形式都可以： Bob ought to be at home now, shouldn’t/ oughtn’t he?
Unit 2 Healthy Eating
Grammar
情态动词的用法(II)
ought to
1. 表示责任和义务，意为“应该”，与should同义。 ① You ought to be more careful when you cross the road next time. ②You ought to work harder than your brother.
have to
(2010湖南) You _D__ buy a gift, but you can if you want to. A. must B. mustn’t C. have to D. don’t have to
need
1.need用作情态动词，后接动词原形，没有人称和数的变化， 通常用于否定句和疑问句。
We dothe truth.
dare
1. dare作情态动词时多用于疑问句、否定句、条件状语从句 以及表示怀疑的名词性从句中，意为“敢...”。
①I _d_a_r_e_n_o_t_(不敢)walk through the wood at night. ②If you d_a_r_e_c_h_e_a_t_i_n_t_h_e_e_x_a_m_(敢在考试中作弊), I will
need开头的疑问句的肯定回答用must/have to, 否定回答则用needn’t。 --Need I hand in my paper now? --Yes, you m_u_s_t_/_h_a_v_e__to_./ No, you _ne_e_d_n_’t__.
[注意]ought to的否定形式为ought not to(oughtn’t to), 一般疑问形式是将ought提至句首，其否定答语通常 用don’t have to或needn’t(与must同)。
①--_O_u_g_h_t _ he to see the doctor? --Yes, he _o_ug_h_t__to_. No, he n_e_e_d_n_’t_/_d_oe_s_n_’t__h_av_e__t_o.
give you some punishment. ③_D_a_r_e_y_o_u_a_s_k_him personally?你敢当面问他吗？ ④_H_o_w__d_a_r_e_y_o_u_a_s_k_me such a question?你怎么敢问我这
个问题？
dare
2. dare作实义动词时，在否定句中不定式符号to也可以省略。 ①The children _d_o_n’_t_d_a_r_e_(_t_o_) _/_d_a_re__n_o_t _(不敢) make a
need
(2012天津) It’s quite warm here; we __C__ turn the heating on yet. A. couldn’t B. mustn’t C. needn’t D. wouldn’t
need
2.need用作实义动词，有时态、人称、数的变化，可用于一 切句式，其宾语可以是名词、代词、动名词或动词不定式。 构成否定句和疑问句时要借助于助动词do。
have to
1. have to意为“不得不”，侧重客观需要，有时态、人称 和数的变化；must强调说话人的主观看法。 ①He _h_a_s_t_o_(不得不) leave now. ②I _h_a_d_t_o_(不得不) leave yesterday. ③We w_o_n_’t__h_a_ve__t_o_(没有必要)start next week.
2. have to的否定式和疑问式需要借助助动词do。 ①_D_o__y_o_u_h_a_v_e_t_o__(你必须)tell him about that? ②They _do_n_’t__h_a_v_e_t_o_(没有必要)buy a computer now.
[注意]don’t have to常可以回答must提问的一般疑问句，而 must的否定式mustn’t表示“禁止”。 ①You m__u_st_n_’t_ come here without permission.
①He _n_e_e_d_s our help. ②这辆自行车需要修理。
The bike needs__re_p_a_ir_i_n_g/__t_o_b_e__re_p_a_i_re_d_. The bike needs/wants/requires repairing/ to be repaired. ③我们没有必要告诉他真相。
sound while their parents are sleeping.
“情态动词+have done”表猜测
1. must have done表示对过去发生的事情进行肯定的推测， 意为“想必/肯定/准是已经...”，只用于肯定句中。
The ground is rather wet, so it _m__u_st__h_a_ve__r_a_in_e_d_(rain) last night. [注意]此时它的否定式为can’t/ couldn’t have done,表示对过
②You _o_ug_h_t__no_t__t_o_(不应该)make this kind of mistake again.
ought to
2. 表示可能性，一般指较大的可能性，意为“按道理应该”, 与should同。
① They ought to win—they’ve trained hard enough. ② If he started at six, he ought to be here now. 3. 在反意疑问句中，下面两种形式都可以： Bob ought to be at home now, shouldn’t/ oughtn’t he?
Unit 2 Healthy Eating
Grammar
情态动词的用法(II)
ought to
1. 表示责任和义务，意为“应该”，与should同义。 ① You ought to be more careful when you cross the road next time. ②You ought to work harder than your brother.
have to
(2010湖南) You _D__ buy a gift, but you can if you want to. A. must B. mustn’t C. have to D. don’t have to
need
1.need用作情态动词，后接动词原形，没有人称和数的变化， 通常用于否定句和疑问句。
We dothe truth.
dare
1. dare作情态动词时多用于疑问句、否定句、条件状语从句 以及表示怀疑的名词性从句中，意为“敢...”。
①I _d_a_r_e_n_o_t_(不敢)walk through the wood at night. ②If you d_a_r_e_c_h_e_a_t_i_n_t_h_e_e_x_a_m_(敢在考试中作弊), I will