What is the main verb of this sentence?

It's surprising that he can run so fast.

He has a habit of reading a book every day.

He left the room in just a moment.

A verb plays the role of expressing actions or states in a sentence.

What? I couldn't catch what you said.

Could you bring me that, whatchamacallit?

Please choose anything you want.

Do you have something to drink?

We need personnel who can handle any problem.