What do you think of it?
你认为怎样？

What's your opinion on this matter?
你对这个问题有什么看法？

Please tell me frankly your opinion.

请坦率直言你的意见。

How do you see things like this?

你对这类事情怎么看？

How did you find / like / enjoy the performance?

你认为演出怎么样？

How do you like changing the color to light blue?
把颜色改为淡蓝色你觉得怎么样？

What do you say to (making) transshipment at Hong Kong?
在香港转船，你意下如何？

How would you like it to be?
你希望是什么样？

Do you agree to this change? I'd like to hear your opinion about it.
你同意这样的改变吗？我想听听你的意见。

We are old friends. Please don't hesitate to speak out your mind.
都是老朋友了，有什么就说什么，不用顾虑。

Will you let me know your comments on our new design?
请把你对我们新设计的意见告诉我。

Your comments and criticisms are always welcome.
欢迎评论和批评。

We welcome all sorts of criticism.
我们欢迎各种批评。

We'd like you to give us your suggestions.
希望把您的建议告诉我。