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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.