中级美国英语Lesson5:助动词should和must

三.MUST

下面我们来学另外一个助动词 must. 这个字表示必须作某件事情, 没有 其他选择. 比方有一句话: " 亨利要上飞机了, 他非有飞机票不可 ", 这句 话英文可以这么说: Henry is going on an airplane. He must have a ticket.

现在我们给你多举一些例子. 每个句子我们还是念两遍, 还是请你听一 遍, 重复一遍.

M: Henry is going on an airplane. He must have a ticket.

F: Henry is going on an airplane. He must have a ticket.

M: Kate is going to a formal party. She must wear a dress.

F: Kate is going to a formal party. She must wear a dress.

M: Linda is going to buy a record. She must save some money.

F: Linda is going to buy a record. She must save some money.

M: Mary has an exam tomorrow. She must study hard.

F: Mary has an exam tomorrow. She must study hard.

M: Peter has a class at 7 o'clock. He must get up early.

F: Peter has a class at 7 o'clock. He must get up early.

M: Susan doesn't have a car. She must go to her job by train.

F: Susan doesn't have a car. She must go to her job by train.

must 的否定式是 must not, 也可以简缩为 mustn't. 这个词是用来表示一定 不应该作的事. 下面这组练习内容都是说彼得在上课的时候不应该作的一 些事. 由老师先念一个句子: peter mustn't sleep in class. 接着老师念一个 新词组: eat lunch. 请你用新词组把原来的句子改为: Peter mustn't eat lunch in class. 好, 现在我们开始作换字练习. 每作完一句就请你听正确答案.

M: Peter mustn't sleep in class.

M: eat lunch

F: Peter mustn't eat lunch in class.

M: talk

F: Peter mustn't talk in class.

M: smoke

F: Peter mustn't smoke in class.

M: write letters

F: Peter mustn't write letters in class.

M: look out of window

F: Peter mustn't look out of window in class.

M: listen to the radio

F: Peter mustn't listen to the radio in class.

四.HAVE TO

刚才我们学习了两个助动词 should 和 must, 还有它们的否定式 shouldn't 和 mustn't, 现在我们来学习另外一个意思跟 must 相同的词组 have to. 这 个词组也是用来表示非作某件事不可. 比方有一句话: "你非得清理院子 吗?" 英文可以这样说: Do you have to clean the yard? 另外一句话: "你非 得工作挣零用钱吗?" 英文可以这样说: Do you have to work to earn your allowance?

好, 现在我们来练习这类句子.由老师念一个句子, 然后老师给你一个新词 组, 请你用这个新词组作换字练习. 作完一句就听正确答案.

M: Do you have to clean the yard?

M: practice everyday

F: Do you have to practice everyday?

M: go to the supermarket

F: Do you have to go to the supermarket?

M: wash the dishes

F: Do you have to wash the dishes?

M: change your clothes

F: Do you have to change your clothes?

M: work to earn your allowance

F: Do you have to work to earn your allowance?

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