as soon as:即时,后面一般加第三人称单数,但也可以用将来时态,主要看前面的时态.
since：由于,要读懂句子的意思,是一个转折关系,这时用since
when：后面一般加过去式
while:后面一般加现在进行式
as soon as since when while区别
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