内容正文:
1.have to 不得不 ,后接动词原形,表示由于不得不做某事
(1)肯定结构:主语+have to +动词原形+…
一般现在时,主语是第三人称单数时,用has to ;
My mother is ill, I have to stay at home and look after her.
(2) 否定结构;主语+don’t have to+动词原形+…
一般现在时,主语是第三人称单数时用doesn’t have to ;
(3)疑问结构: Do/Does +主语+have to +动词原形
2. must 必须,应当
(1)肯定结构:主语+have to +动词原形+…(没有人称变化)
We must finish our homework every day.
Everyone must obey the rule. 每个人必须遵守规则。
(2) must的否定形式mustn’t表示“不应该”、“禁止”、“不准”。
例如:You mustn’t speak like that. 你不准像那样说话。
You mustn’t be late for school. 你禁止上学迟到。
(3)疑问结构:Must +主语+动词原形
——Must I be home before 8 o’clock?
——Yes,you must. ——No, you needn’t./No, you don’t have to.
①You have to give up smoking . (改为否定句)
_____________________________________.
( ) ②— Can you come to my party on Wednesday?
— Sorry, I can’t . I _____ finish my homework.
A. may B. would C. have to
③-- you get home at 5:30?
--Yes.I do.
A.Must;/ B.Must;have to
C.Do;have to D.Have;to
④---Must I do my homework after dinner? ---No,you. _____.
A.mustn’t B.don’t have to
C.don’t D.must
3.exercise
1)exercise 作动词,意为“运动,锻炼”等时例如: Every day I exercise before I go to sleep.
我每天睡觉前锻炼。
We should constantly exercise our muscles. 我们应当经常锻炼肌肉。
2)exercise 作名词,意为“练习,操”等时,是可数名词。意为“锻炼”时,是不可数名词。
例如: We should do eye exercises. 我们应该做眼保健操。
Let's take exercise together. 让我们一起锻炼吧。
【课堂练习】 I like to ________. I always do morning ________ in the morning.
A exercises, exercises B exercise, exercise C exercise, exercises
4. taste
1)taste意为“吃,品尝,喝,”。
例如: I can taste something sour. 我尝到了酸味。
Sometimes when you are ill, you can't taste properly.
有时生病时吃什么都没有滋味。
2)taste意为“吃起来,尝起来”。
例如: The soup tastes good. 这汤的味道不错。
The pizza tastes delicious. 比萨饼很好吃。
3)taste 还可以作名词,意为“味道,味觉,品味”等。
例如: I like the taste of wine. 我喜欢葡萄酒的味道。
She has excellent taste in dress. 她在服装方面有极高的品味。
【课堂练习】 Ice-cream is not good for us, but it tastes _______.
A. well B. good C. bad
5.tooth
tooth 名词,意为“牙齿”,可数名词。其复数形式是特殊变化teeth。
例