新概念英语NCE1_lesson127-128(共35页)课件

I _m_u__s_t ___ take a taxi, because I don’t want to go there by bus.
I _h_a_v_e_t_o__ take a taxi, because I can’t get a bus.
Review!
has to
have to 不得不，必须 will have to
否定式的意义不同 must 的否定式 mustn’t 意为“一定不要”、“不允
许”;而 have to 的否定式 don’t have to 意为“不 必”(=needn’t)。比较： You mustn’t tell him about it.你一定不要告诉他这件事。
(这可能是秘密) You needn’t tell him about it.你不必告诉他这件事。
He must be playing the piano.
I think they are eating. I don't think so. They can't be eating.
They must be talking.
I think they are singing. I don'tnging.
2. We must help each other. We must study hard．我们一定要努力学习。
He had to go on foot because there was something wrong with his car.因为他的汽车坏了，他不得不走着去。
Review!
They must be dancing.
What are their job?
I think he is a cook. I don't think so. Hec_a_n_'_t _b_e__ a cook. He _m_u_s_t__b_e_ a baker.
I think he is 65 years old. I don't think so.He can't be 65. He must be 70 years old.
Guess:What are they doing?
I think he is singing.
I don't think so.He can't be singing.
must 必须
had to have had to
have to 强调客观的需要，含有“不得不，被迫”的意
思。而must 强调主观的看法，即主观上的必要，有责任，
有义务去做。have to 有人称，时态的变化，而must没
有1。. Mum isn’t at home, so I have to look after my sister.
•
Beck:贝克。
What nationality is he?
I think he is French. I don't think so. He can't be French.
He must be Germany.
Guess！How old are they?
I think she is 35 years old. I don't think so.She can't be 35. She must be 40 years old.
(他可能知道了)
What nationality is she?
I think she is Chinese. I don't think so.She can't be Chinese. She must be Japanese.
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Lesson 127
snow heavily must have to
stay at home
It is snowing very hard , so I have to stay at home. …, so I don’t have to / don’t need to meet Alice at the station.