right now用与什么时态

现在进行时
I am doing homework right now.
right now其实就等于now

将来时

You can pick the car up right now.
你马上就可以把车开走。

You had better answer his letter right now.
你最好马上给他回信?

Get to work or resign right now.
快去上班，否则请马上辞职。

也可以进行时：

You're right. That's what we are doing right now.
你说得对，那正是我们目前在做的。