have to 表示 “ 不得不，必须，需要 ” 肯定 否定 疑问与回答 现在 have/has to don’t/doesn’t Do you/ Does he have to…? have to Yes, I do./Yes, he does. No, I don’t./No, he doesn’t. 过去 had to didn’t have to Did you/he have to…? Yes, I did./Yes, he did. No, I didn’t./No, he didn’t. 将来 will have to won’t have to Will you/he have to…? Yes, I will./Yes, he will. No, I won’t./No, he won’t.

e.g. My mother is ill. I have to look after her at home. He has to go to school today. Do you have to leave so early? Because my father was ill, we had to keep quiet all day long. We will have to get up early tomorrow. 翻译上述句子，并改为否定句和一般疑 问句。

Have to 和 must 的比较： 1. Must 表示 “ 必须 ” ， have to 表示 “ 必须，不 得不 ” 。但 have to 多指客观情况的限制， 而 must 则多强调主观色彩。 e.g. I must study hard because I want to be a teacher in the future. ( 主观愿望） I had to study English hard because I didn’t pass the English test. ( 客观需要） 2. must 没有人称和数的变化，无论是表示现 在，过去或将来，都用 must

3. mustn’t 表示 “ 不准，不应该 ” ，而 have to 的 否定式则表示 “ 不必，没必要 ” e.g. You mustn’t smoke here. You don’t have to come early. *finish the exercises on P18

Oral practice: Model: Your English is poor. (study hard) What do you have to do? I have to study hard. 1. He is in poor health. (do more exercises) 2. She felt tired. (go to bed early) 3. You have a headache. (take some medicine) 4. We will have an English contest. (practise English)

Complete the following sentences with “ have to” in its proper form( 用 have to 的适当形式完成下 列句子） 1. I _____ stay at home because it was raining hard. 2. He ____ go over his lesson because he will have a test tomorrow. 3. He is going to catch an early train. He ____ get up early. 4. Tomorrow is Sunday. Students ____ go to school. 5. A: ____ you ____ finish your homework before class is over? B: No. We can finish it at home.

Homework: 1. WB P7 “Language Focus” 2. Preview “Tuning In”

chips chocolate sweet Ice cream

hamburger French fries pizza Fast food Western food

Junk food Unhealthy food

rice noodles Chinese food

meat seafood

fruit vegetables Green food

yoghurt Dairy food milk