now that是个从属连词,可以归入because,as,since这一家族,意思和since(既然,由于)接近,但now?that必须引出一个新的情况,否则需要由别的词替代。
例句:
Now you're settled, why don't you take up some serious study?
既然你现在已经安顿下来了,为什么不开始正经地学点东西呢?
Now that she was retired she lived with her sister.
现在她已经退休了,和姐姐一起住。
Now that he’s got this job, there’ll be no holding him back .
既然他现在已经得到了这份工作, 就没有什么能制约他的了。
now that用来说明一种新情况,然后加以推论。
例句:Now that you are ready, we'll start at once.既然你已经准备好了,我们马上开始。
since指双方都明确的原因或众所周知的原因,侧重主句,从句表示显然的或已知的理由。
例句:Since you don't like it, I'll put it away.既然你不喜欢,我就把它放在一边。
as意思是“由于,鉴于”,指客观事实,常与since互换使用。
例句:As there was no answer, I wrote again.鉴于没回复,我又写了一封信。