now是不是介词

不是。

adv. 现在如今立刻

adj. 现在的

n. 现在目前

conj. 由于既然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。