不用。

It's not actually raining now.其实现在并没有下雨。I'm now based at headquarters.我现在在总公司工作。Jim now works in construction.吉姆现在从事建造业。People are better educated now.现在人们教育程度更高了。I see things differently now.现在，我看问题的方法不一样了。

now是使用频率极高的常用副词，无论放在句首、句中还是句尾一律不用逗号隔开。

可以，意思是停顿一下再说现在要干嘛