你对什么感兴趣? 

What are your interests? *interest “爱好”、“关心的事”。
What are your interests? (你对什么感兴趣?)
I'm interested in art. (我对美术感兴趣。)
What are your interested in?
What kind of things are you interested in?
What do you like?

我从没做过。
I've never done that.
I've never done that before.
That was the first time for me. (我可是头一次。)

你去国外旅行过吗? 
Have you ever traveled abroad?
Have you ever traveled abroad? (你去国外旅行过吗?)
Yes, twice. (是的，去过两次。)
Have you been overseas? (你去国外旅行过吗?)

你去哪儿了? 
Where have you been?

我去美国和德国了。 
I've been to the U.S. and Germany.

下次你想去哪儿? 
Where do you want to go next?
Where do you want to go next? (下次你想去哪儿?)
No place particular. (没有什么特别的地方。)