Nǐ zěnme kàn?
你怎么看?
What do you think?
Notes:
你(nǐ): you
怎么(zěnme): how
看(kàn): to look
Example:
A:你怎么看?
Nǐ zěnme kàn?
What do you think?
B:我不知道。
Wò bù zhīdào.
I don't know.