have to的否定式由“don’t have to+动词原形”或“doesn’t have to+动词原形”构成。例如：
You don’t have to do like this.你不必这样做。
He doesn’t have to be there on time. 他不必按时到那里。
have to的否定式还可在have／has后面加not （仅限于一般现在时和一般过去时）。例如：
He hasn’t to go there.他不必去那里。
I haven’t to get up early.我不必早起床。
四、have to的疑问式
have to的一般疑问式通常由“Do/ Does + 主语+nave to+动词原形+其他成分”构成，肯定回答用do或does；否定回答用don’t（have to）或doesn’t（have to）。例如：
①–Do you have to go now?你现在就得去吗？
–Yes, I do.是的。
②–Does he have to hay home? 他必须留在家里吗？
–Yes, he does. 是的。
（No, he doesn’t (have to) . 不，他不必留在家里。）
五、have to的时态
have to可用于各种时态。其一般过去时的肯定式是had to，否定式是didn’t have to；一般将来时的肯定式是will have to，否定式是won’t have to。例如：
He said he had to see me about something important．他说他有重要的事情不得不见我。
He said they didn’t have to borrow 200 yuan from John．他说他们不必向约翰借二百元。
You will have to do that again．你得重做那件事。
She won’t have to go with you. 她不必跟你去。
六、have to与 must的区别
1．have to有人称和数的变化，即第三人称单数用has to，其他人称用have to；而must没有人称或数的变化。例如：
He has to go there．他必须去那里。
She must be off now．她现在必须走了。
2．have to有时态的变化，must没有。例如：
He told me that I must be at the station by ten．他告诉我必须十点前到达车站。
He had to pay for it．他不得不赔偿。
3．have to强调客观上“不得不”做某事；must指主观上“必须”做某事。例如：
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。
Lesson 69教学设计方案
Teaching Objectives: Let the students understand “have to” and grasp how to use it. Learn some useful phrases and structures.
Language Focus: What’s the trouble? What’s the matter with you? have a headache, take one’s temperature, nothing serious, take this medicine three times a day, feel like eating, have( got) a pain in one’s head
Properties: Recorder, Overhead projector
Teaching Procedures:
I .Organizing the class
T: Ask the students to get ready for the class.
Greetings and a duty report.
II. Revision
1. Get the students to act out the passage in Lesson 68.
2. A quiz for them:
(l)have a good time (2)at the head of (3)in fact (4)look after (5)get on (6)stand in line (7)quarrel with (8) invite. . . to. . . (9) make a noise (10) laugh at (11) not. . . until (12)make friends (13)throw about (14)get off (15)feel well (16)complain about (17)at the end of (18) give the message to sb. (19) grow up (20) telephone sb.
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