1. have to/must

• have to和must的意思都是：必須

        I have to get up at 7.

        I don't have to get up at 7.

        You must come with me.

        You mustn't come with me.

• have to與must的區(qū)別：二者的區(qū)別非常微小，可以相互替代。如果一定要找出區(qū)別，那么have to更傾向于指因外部的要求而必須做的事情，must更多是指因內(nèi)部要求而必須做的事情。比如：I have to take my medicine twice a day.（每天吃兩次藥，來(lái)自醫(yī)生的要求）I must study hard.（好好學(xué)習(xí)，來(lái)自自己的要求）

• 當(dāng)我們需要用過(guò)去式時(shí)，就必須要用have to的過(guò)去式had to，而不能用mustI had to be ready by the end of the day yesterday.

• must的過(guò)去式是must have，但must have的意思不是“必須”，而是對(duì)過(guò)去的一種猜測(cè)He must have read this book before.（他以前肯定讀過(guò)這本書）

2. 主語(yǔ)代詞/賓語(yǔ)代詞

• 在英語(yǔ)中代詞有主語(yǔ)代詞與賓語(yǔ)代詞之分

• 主語(yǔ)代詞：I, we, you, he, she, it, they

• 與主語(yǔ)代詞相對(duì)的賓語(yǔ)代詞是：me, us, you, him, her, it, themI do not like him.She is working with them.

• 做一做下面的練習(xí)：

• A: He / Him ’s a great basketball player. B: I don’t like he / him at all.

• A:  The children are tired. Can you put they / them to bed?B: Where are they / them?

• A: Where’s mum? I can’t see she / her.B: There she / her is!

• A:  We / Us can’t do this homework. Can you help we / us?B:  Daniel is good at Maths. Why don’t you ask he / him?

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