do somone good　对某人有好处

Having some moring exercises does you good.

Do you get me?　你明白我的意思吗?

doesn't count 这次不算

It doesn't count this time,try again.

doesn't make sense　不懂;没有任何意义

The sentence you made doesn't make any sense to me.

down and out 穷困潦倒

Being down and out,he couldn't support his family.

drive at　用意，意欲

What's he driving at?他用意何在?

drop in 偶然拜访

I dropped him in on my way to the hospital.

drop me a line　写信给我

On arriving the University,please drop me a line.