New Concept English新概念英语第一册_第125-126课.pptVIP

Language points 1. Cant you come in and have tea now, Peter? 这是否定疑问句，表示邀请。 can’t you …. 表示说话人希望听话人做某事的强烈意愿和看法。 例 Can’t you come and help me? 你就不能来帮帮我吗？ 2. I must water the garden first. 3. Do you have to water it now? 4. It’s terribly dry. 5. Dont you remember? 这也是否定疑问句。 Language points 6. I had to water it every day. 7. Well, I’ll have tea by myself. 8. look out of the window. 9.That means you don’t need to water the garden. 表示“不必”，是 must和 have to的一般现在时否定式。 10. That was a pleasant surprise. 真是意想不到的好事。 从…往外看 don’t have to needn’t Grammars She has to leave early. She must leave early. Does she have to leave early? Must she leave early? She doesn’t need to/ have to leave early. She needn’t leave early. 陈述句 疑问句 否定句 have to 与must must 表示主观的认为有必要，有义务 have to 表示含有客观的环境方面的需要， 除了“必须”之外，还有“不得不”。 must 没有时态和人称的变化 I must ,he must have to 有时态和人称的变化 I have to, he has to eg. I must work hard. 我必须努力工作。 (我觉得有必要这么做。) I had to go home by ship last night. 我昨晚不得不乘船回家。 (有可能没有赶上其他的航班或者火车，没选择才坐船。) Grammars Grammars ? Must I arrive on time? -Yes, you must. -No, you neednt. Do I have to arrive on time? -Yes, you have to. -No, you dont have/need to. Must I take care of my grandma? Yes, you ____./No, you ______. (must; neednt) Does she have to come home before 7? Yes, she _____./No, she __________. (has to; doesnt have to/neednt) Exercises My brother was very ill, so I had to call the doctor in the middle of the night.　 我弟弟病得很厉害,我只得半夜里把医生请来。(客观上需要做这件事) He said that they must work hard. 他说他们必须努力工作。(主观上要做这件事) He had to look after his sister yesterday. have to有人称、数、时态的变化,而must只有一种形式。但must 可用于间接引语中表示过去的必要或义务。 You don’t have to tell him about it.　 你不一定要把此事告诉他。 You mustn’t tell him about it.　　　　你一定不要把这件事告诉他。 在否定结构中:don’t have to 表示 “不必”, mustn’t 表示“禁止”。 小结have to和must 两词都是 “必须”的意思, have to 表