Stand up,please.

请站起来。

I'd like to talk with Mr. Johns or Mr. Smith.

我想与约翰斯先生或史密斯先生谈话。

What's your address?

你的地址是什么？

If you have time,will you call me tomorrow?

如果你有时间，你明天将打电话给我？

I doubt that I'll do anything tomorrow.

我不确定我明天将做什么事。

I didn't know whether to send the letter airmail or not.

我不知道是否送航空邮件。