You have a minute? / Do you have a minute?

You have a minute? I want to discuss this issue with you.

你现在有空吗？我想和你讨论一下这个问题。

Are you available?

available 在此的意思是“可会见的、可与之交谈的”,Original How to Design a Great Web Page: Tips and Tricks由此衍伸为“有空的”；没空就是 "not available"

- Are you available? I need your help.

-Sure.

-你有空吗？我需要你的帮忙。

-当然可以。

Can you spare some time?

spare 有“抽出、匀出”的意思

-Can you spare some time to come out with me?

-Sorry, I'm afraid (I can't).

-你有空和我出去吗？

-抱歉，我恐怕没空。

When will you get around to doing sth? / When did you find time to do sth?

-When will you get around to traveling?

-Maybe next week.

-你什么时候有空去旅游？

-下星期吧。

When you time off?

have time off 表示 “有空”

Finally, I have time off to go downtown and shop.

我终于有时间去市中心购物了。

其他相关的表达

When are you free?

你什么时候有空？

I'm free today.

我今天有空。

Whenever.

什么时候都行。

That's a bad day for me.

那天我不行。

It's a date.

一言为定。

What do you do when you have time off?

你有空的时候会做些什么？

I will visit you as soon as I'm at liberty.

我一有空就会去看你的。

I have no leisure for sport.

我没空运动。

I'm occupied at the moment.

我现在没空。