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在as／since／seeing that意指以前共知的或共知的陈述时，可用if来代替：
As／Since／Seeing that／If you don’t like Bill，why did you invite him？
既然／如果你不喜欢比尔，你为什么邀请了他？
由in as much as considering that now that引导的原因状语从句。
I am ready
to accept your proposal in as much as I believe it to be the best you can
offer.我准备接受你的意见，因为我很是相信你提供的是最好的。
Considering
that he has only been learning English for a year he speaks it very well.(它可以)因为他只学了一年英语，他就能说的很流利（好）。
Now that we
have finished the course we shall start doing more revision work.既然（因为）我们完成了课程，我们应开始做修正工作。（修正，修订，校订。Reviser校订者。Revised经过修订的.revise .vt. 复习，修改）
由介词词组by reason that for the reason that in the view of (the fact) that
on account of (the fact) that on the gronds that because of owing to due to
thanks to in that等引导的原因状语从句。
He left on
the grounds that he was ill.
Wine is
scarce here by the reason that it is prohibited.
Owing to the
rain the match was cancelled.
In view of
the heavy rain we will put off the outing.
Thanks to my
illness I have the opportunity to improve my character.
其它的表示原因的从属连词：
The
reason…is that…
The reason
she refused to go was that she had no money.他不去的原因是他没有钱。
I can’t tell
you anything when you won’t listen.既然你不想听，我就不说什么了。
In that\ for
that he is ill he feels unable to do it.因为他病了，所以他感到无能为力。
If I find
fault it is that I want you to do better in the future. 如果我指出你的缺点是因为我希望你将来做的更好些。
We rented
the house not because we like it but because there was no other house to let.我们租下这个房子不是因为我们喜欢它而是因为这没有其他的房子可租。
It is not
that I am unwilling but that I have no time .不是我不愿意，而是我没有时间。
注意：if so的用法：
—I hope Bill
won’t come． —If so（＝If you hope he won’t come），why did you invite him？
—我希望比尔别来。 —如果这样（=如果你希望他不来），你为什么邀请了他？
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