do是什么意思did是什么意思

I could do it now, if you like.

如果你愿意的`话，我现在就可以做这事。

A change of job would do you the world of good.

换一下工作会对你大有好处。

One major problem did present itself, though.

不过，确实出现了一个重大问题。

One major problem did present itself, though.

不过，确实出现了一个重大问题。

What time did you get back last night?

你昨晚什么时候回家的？