【unit】Unit 11 Work Around the House
【jiaoan.jxxyjl.com--七年级英语教案】
lesson 3
(一)大声读单词
1. must aux. v. 必须,应当
2. mustn’t = must not 禁止,不准许
3. don’t have to 不必
(二)重点词汇
1. must aux. v. 必须,应当
2. mustn’t = must not 禁止,不准许
3. don’t have to 不必
这组词的用法请参考下面的“重点解析”部分。
(三)重点解析:must 与have to
1、must 的用法:
1)must表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须……,得……,要……”;
we must find a good method to learn computer well. 我们必须找一个学好电脑的方法。
you must attend the class meeting.你应该出席这个班会。
he must return the story-book.他必须将这本故事书还回来。
2)由must引起的疑问句,肯定回答要用must或have to,否定回答要用needn’t或don’t have to,意思是“不必”。
如:-must i finish the work before 3 p.m.? 我一定要今天下午3点前完成工作吗?
-no, you needn’t. 不,你不必。
如: -must i clean the classroom? 我必须打扫教室吗?
-yes, you must. 是的,你必须。
no, you needn’t. /no, you don’t have to. 不,不必了。
3)must的否定形式mustn’t表示禁止,意思是“不能,不许”。
you mustn’t be late again next time. 下次你不准迟到了。
you mustn’t go swimming today. 你今天不许去游泳。
you mustn’t drive so fast. 不许开得这么快。
4)must表示肯定的猜测,常用于肯定句中,意思为“一定是,必然……”。
注意must表示推断或猜测的几种情况:
your sister must be a doctor in this hospital.(对现在的猜测)
你姐姐一定是这家医院的医生。
if you were at the party, you must have seen mary. (对发生在过去的事情的推测)
你如果参加了聚会,准会见到玛丽。
2、have to 的用法:
1)have to表示一种客观的需要,意思是“不得不”。
如:i have to attend an important meeting this afternoon.
今天下午我不得不参加一个重要的会议。
mother is out, so i have to look after the shop.
妈妈不在家,因此我不得不照看商店。
2)have to的否定形式是don’t have to,相当于needn’t。
如:they don’t have to buy a computer at present.
他们目前没有必要买电脑。
【典型例题】
1. neither li ming nor his brother a new bike.
a. have b. has c. to have
2. my class has lots of tests. it the teacher.
a. depends on b. makes sure c. helps with
3. he speaks , so he is to understand. 12
a. slow, easily b. slowly, easy c. slowly, easily
4. they about their family last night.
a. are talking b. were talked c. were talking
5. in my family my mother make the bed every day.
a. have to b. has to c. had to
【参考答案】
1. b 2. a 3. b 4. c 5. b
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