since
[连词]
used to express a reason for something
Ex: They did n't go on the since they could n't afford it .
so
[连词]
used to summarize or draw a conclusion based on previous information or to provide a logical inference

所以, 因此
now
[连词]
used to indicate a result or outcome related to what has just been said or happened

现在既然你完成了工作,你可以休息一下。, 现在因为你已经完成了工作,所以你可以休息一下。

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