[析] far有两个比较级 farther 较远的，further 进一步的，如：Do you need any further explanation? 你需要进一步的解释吗?当然它也有两个最高级。farthest和furthest.
[误] I went to Beijing University five years before.
[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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