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我必须见老板。（主观要求）
They must leave (tomorrow).
他们（明天）必须出发。
They had to leave.
他们（当时）不得不出发。（过去时中用 have to 代替）
They have had to leave.
（译文同上）
（2）have to和 have got to往往可以互换：
I have to/have got to leave home every morning at 7:30.
我天天早上7点半就得离开家。
但是，与always，sometimes 等频度副词连用时，用have to往往比用have got to好：
I often have to get up at 5. Do you ever have to get up at 5?
我经常5点就得起床。你有时候也得5点起床吗？
have got to比have to听上去要更加口语化一些：
（3）在表达“难道你不能不（做……）”的含义时，一般用“Must you…？”句型而不用“Do you have to…？”或“Have you got to…？”句型：
(4）must还可以用来表示推测：
He must be at home now.
他现在肯定在家。
He must be mad to drive anywhere today!
他今天居然开车出去，真是疯了！
词汇学习 Word study
1．appear vi.
（1）出现，显露：
Suddenly, a car appeared.
忽然，一辆小汽车出现了。
（2）当众露面；登场（演出等）：
I can't appear in this dress at the party.
我不能在晚会上穿着这身衣服露面。
Miss Marsh will appear in tonight's play.
在今晚的这场剧中，马什小姐将会登场。
（3）似乎，看起来好象（与seem同义）：
She appears to know you.
她似乎熟悉你。
Now it appears you are wrong.
现在看来你是错的。
2．grow vi.
（1）生长，成长，发育：
Trees of this kind don't grow in our country.
我们国家不长这种树。
How tall you've got! You've grown a lot.
你已经这么高了！你长了不少。
（2）grow up 长成，成熟（其被动态表示长大成人）：
Lucy has grown up a lot since I last saw her.
自从我上次见到她之后，露西已成熟了许多。
What do you want to do when you're grown up?
等你长大了，你想干什么？
3．as的几种用法
（1）作为介词，它可以表示“作为”、“以……身份”等：
In this film, he appeared as a policeman.
在这部影片中，他扮演一名警察。
As a mechanic, he can't always keep himself clean.
作为一名机修工，他无法总保持身上干净。
（2）作为连词，它可以表示“因为”、“正当……时候”、“以……方式”或“如同……那样”等含义：
You must take care of the baby tomorrow as I am going to London.
由于我要去伦敦，你明天必须照料这孩子。（因为，由于）
As we were talking about him, he knocked at the door.
我们正谈论他的时候，他敲门了。（正当……时候）
She cooked the dinner as her mother taught her.
她按母亲教她的方式做了晚餐。（以……方式）
练习答案 Key to written exercises
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