How about some ice cream?

来点冰淇淋如何?

That's a good idea.

那是个好主意。

That sounds good.

听起来不错。

Why don't you take a rest?

你何不休息一下?

Why not give it a try?

你何不试试?

Why don't you have a look?

你何不看看?

Why not check out the newspaper?

你何不查一下报纸?

Could you check out the newspaper?

你可以看看报纸有没有吗?

You'd better see what is on.

你最好先看看有什么(电影)上演。