Now that you are busy ,let me do it for you.这句中的now that能换成While 还是Since请讲下语法 翻译,

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Now that you are busy ,let me do it for you.这句中的now that能换成While 还是Since
请讲下语法 翻译,

Now that you are busy做原因状语,其中的now that是“既然,由于”的意思,可以用since替代!While表转折,不可替代now that!
原因状语从句主要的有because,as,since,seeing (that),now (that),considering (that)
等引导.
在原因状语从句中,now that同since相似都表示既然、因为的意思,但语气较弱,强调人们已知的事实.例：
Now that you are busy,let me do it for you.既然你忙,就让我给你做吧.
Since we’ve no money,we can’t buy it.因为我们没有钱,我们没法买它.
区别：since和now that,表示事物发展的自然结果,特别是当对方大概已经了解其原因的情况下使用,表示既成事实的原因一般位于主句之前.
另外,在原因状语从句中because通常表示直接的原因.for是并列连词,引出的原因较间接,似乎是事后所想到的补充解释的理由,只陈述一般推断的理由,不一定表示产生结果的必然原因,主要放在两个并列句之间.

since 既然

now that意为既然，只有since有这个意思。

Since~ now that 意为 既然 、由于，等价于since ，充当连词。
while 只是意思不对，表转折或正当

换成since。有“既然你很忙，就让我帮你做吧”的意思。换成while的话意思不对。

supposing that now you are at the airport,then you can directly take the blue bus to get to the hotel.4124 A：Where are you going now?B：The bus stop A：《 》are you going《 》《 The students are waiting for the bus now用aThe students are waiting for the bus now用at that time yesterday改写句子 Are you s( ) in the supermarket now?No,I’m w( ) for a bus. That sounds good. What are you doing now?什么意思? Now you are just somebody that I used to know. 14—supposing that now you are at the airport, then you can directly take the blue bus to get to the hotel. 4124 什么意思?想问：1—take the blue bus to get to the hotel：这里是take the blue bus to do sth 吗?表示乘车去做某事? now i am gone.If that's the case,are you satisfied (now)? where are you now? Are you free now are you free now Are you free now? Where are you now? Now you are lonely now you are talking Are you b() now? how are you now. Know that you are happy now that I can really feel at