1.stay vi.保持。它是半系动词，常和形容词搭配使用。
The temperature has stayed hot this week.
本周气温一直都很热。
【常用搭配】stay on 继续停留，保持
I'm not sure whether to resign or stay on.
我拿不准主意是辞职还是留任。

2.give sb. a hand 帮某人一个忙
The box is too heavy. Can you give me a hand?
箱子太重了。你能帮我下吗？

3.hang in 坚持
We must hang in whenever we come across difficulties.
我们遇到困难时一定要坚持不懈。

4.smack vt.打，掴
I'd a good mind to smack him for being so rude!
他这样粗野，我真想揍他。
【常用搭配】smack down 责骂(便丧失地位)
The boy was smacked down by his parents.
这孩子被父母责骂一顿。

5.calm down （使)平静, （使)安静
Just calm down a bit!
你先静一静！