摘要： since/ for (1) since用于完成时态.既能用作介词.也能用作连词.后常接时间点.意思是“自从 . He has been a worker since he came into this city. 自从他来到这个城市.他就是工人了. I have never seen him since we last met in Shanghai . 自从我们上次在上海见过之后.我再也没见过他. since作连词.还有“既然 的意思. Since you are interested in it, just do it. 既然你对它感兴趣.那就做吧. You can have fun now since you’ve finished your work. 既然你已经做完了功课.就开心玩会儿吧. (2) for用于完成时.用作介词.后常接一段时间.意思是“经过- . I have learned English for five years.我已经学了五年英语了. They have waited for you for 30 minutes.他们已经等了你三十分钟了. for也可以用作连词.但意思是“因为 . They missed the flight for they were late.他们由于完到了而误了航班. He fell ill for many reasons.他由于多种原因病倒了.

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