40) ago与before
ago与before都表示......以前,但用法有所区别。
1.ago意为以前,表示从此刻算起的若干时间之前,常用于过去时的句子
中。如:He took a photo a week ago. 他一周前照了一张相片。
2.before作为副词时表示:
a.从过去某一时刻算起的若干时间以前,用于过去完成时的句子中。如:
The boy had already seen the comedy before.
那男孩以前已经看过那部喜剧片了。
b.笼统的以前,用于一般过去时或现在完成时的句子中,一般单独使
用,而ago不可以单独使用。如:
Hes read this novel before. 他以前读过这部小说。
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