Do you have a book?

你有一本书吗？

I'm twenty-one years old.

我21岁。

My brother and I used to go a lot of places together.

我的兄弟和我过去常一起去很多地方。

It's two blocks straight ahead.

笔直向前走2街区。

Do you have change for a twenty-dollar bill?

你付了一张20美元帐单了吗？

How long has it been since you've heard from your uncle?

自从你听到叔叔的消息有多长时间了？