concentrate on 
全神贯注于
A: I'm trying to concentrate on my job right now.
我现在正试着要专心工作.
B: OK, sorry for disturbing you.
好,对不起吵到你.

watch out for... 
留意，照顾…
You have to watch out for insincere people.
你得小心那些虚情假意的人。

The thing is... 
重点是…，事情是这样的… 。用在句首，引出整句话
The thing is, I have plans on Saturday night.
事情是这样的，我星期六晚上有计划了。

take it easy on... 
对…好一点，手下留情
Slow down there, buddy. Take it easy on the booze.
老兄，喝慢点。喝酒喝慢点。

show...to...
带…去（地方）。介词to后面接名词
Could you please show us to a nice hotel?
你可以介绍一家不错的饭店嘛？