what do you think of=什么

How do you like ...
What do you think about...
What's your opinion?

老兄意下如何?
What do you think of it? = What's your opinion?

这个电影你觉得如何?
How do you like the film? = What do you think of the film?

what do you think of
你认为这件事/物怎样？

What's your idea?

= how do you like……

what's your idea abt....
how's your feeling abt....

你认为（某物）怎么样