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九年级第6单元易混词点拨_九年级英语教案,
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作者：王书政
1. ago; before
ago和before均表示\"以前\"，都可以在句中作副词，放在表示时间的词语之后。但二者有区别：
ago的参照点是\"现在\",常用于一般过去时；before的参照点是\"过去的某个时间点\"，常用于过去完成时。
以two years ago和two years before为例：前者是指从现在算起的两年前。如：
John left a few minutes ago. (以现在为参照点)；后者则是指从过去的某一个时间点算起的两年前。
如：He said that he had seen her two years before. （以他说话的那一刻为参照点）
二者若置于一个句子中，其差别就更容易理解了: I visited him two days ago, but he
had gone to London five days before.
2. sometime; sometimes; some time; some times
sometime是副词，可与过去时或将来时连用，表示\"（在过去）某个时候\"或\"（在将来）某个时候\"。如：
I saw him sometime in May.
I\'ll buy a new house sometime.
sometimes是一个表示时间频率的副词，意为\"有时候\"。如：
Sometimes I help my mother with the housework.
some time多数情况下作名词短语，意为\"一些时间；一些时候\"；它还可以作副词词组，用来表示一个未肯定的时刻，此时它可与sometime互换。如：
I\'ll be away for some time.
Let\'s have dinner together some time / sometime next week.
some times是\"几次、几倍\"之意。如：
They have been there
several times.
3. stop doing; stop to do
stop doing sth.是\"停止做某事\"，动词的-ing形式是stop的宾语，指停止正在进行的事情； stop to do sth.是\"停下来去做某事\"，动词不定式作目的状语。如：
He stopped talking. （他停止了谈话。）
He stopped to talk.（他停下来开始谈话。）
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