now后面加动词原形吗

一般情况下,有 now 的句子用现在进行时,强调时间.即：be doing sth

Now am doing the homeworkNow,she is eating the lunch  Now,they are playing football

有时也可以加动词原形。

Now ,you can leave.

Now l have to go.

Now  It's time to cass.

now可用作副词，表示现在，马上，此刻。用作名词时，有现在，此刻的意思；

用作形容词时有现在的，目前的等含义。

一.now用作副词，表示现在，马上，此刻。

You've got to ask him.It's now or never.你得去问他,机会难得。

Until now she has never been to see a doctor.到目前为止她还没有去看过医生。

二.now用作名词，表示现在，目前。

The boss is being in royalspirits right now.此刻，老板情绪极好。

三.now用作形容词，表示现在的，当今的。

She had now a life filled also with a beneficent activity.她目前的生活里善行颇多。

Now,aliving language has been found that can play the same intermediary role more successfully.

最近，已找到了一种现存的语言，它能更有效地起到中间媒介的作用。