［正］ I went to Beijing University five years ago.?

［析］ ago常与过去时连用，而before则多与完成时连用。?

［误］ - Have you finished your homework??

- No, not already. ?

［正］ - Have you finished your homework??

- No, not yet. ?

［析］ 仍然有三个英文字可以表达它们是already， yet 与 still。 要注意的是 already经常用于肯定句中，如The bus has already gone。 而yet 多用于疑问句和否定句中，如：Have you finished your homework yet? 而still则常用于主语与谓语动词之间，如：We still can't decide what to do. 但也有时用于be 动词之后，如：He is still here.?

［误］ He is very higher than I am.?

［正］ He is much higher than I am.?

［析］ much可以用来修饰比较级，而very则用来修饰形容词原级，如：I'm very tired.

［误］ - Can I walk to the station??- You'd better not. It is very far. ?

［正］ - Can I walk to the station??

- You'd better not, It is a long way. ?

［析］ for一般用在疑问句与否定句中，如：How far is it from here to the station? 又如：It isn't far.?

［误］ I've ever been to America.?

［正］ I've been to America once.?

［析］ once 多用于肯定句，而ever则用于疑问句，否定句，及条件状语从句中，如：Have you ever been to London??

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