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重点词组（词）的辨析： 1. have to /must 不得不，必须 have to 强调客观，must强调主观。例： Mother is ill. I have to look after her. I must study hard. have to有时态、人称变化，否定问句结构用助动词。 have to → don't have to has to → doesn't have to had to → didn't have to will have to → won't have to must的否定式有mustn't和needn't，must只有一般现在时，needn't常作否定回答。 You mustn't eat in class. 上课不要吃东西。 Must I come here so early? 我必须这么早来吗？ No, you needn't . 不，不必。 2. cost/pay for/ spend …on/in doing / take 花钱常用前三者，花时间常用后两者，句式为： Sth. costs (sb.) ＋money. Sb. pays money for sth.. Sb. spends money on (in doing) sth.. 例： The book cost me ten yuan. 我花10元钱买那本书。 I paid ten yuan for the book. I spent ten yuan for /(in) buying the book. take的句式为： It takes sb. ＋time＋to do sth.. 例： I spend much time on books. 我花很多时间读书。 I spend much time (in) reading books. It takes me much time to read books. (责任编辑：admin) |