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 youve 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。
5. neither/ either/ both
(1) neither作代词是对两者都进行否定,意思为两者都不,作主语时谓语动词用单数.
Neither of the boys is from England.这两个男孩都不是来自英国。
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