About 是副词和前置词,
About 在不同语境里有不同意思：
副词
1.大约,差不多； 前后,左右.
About a mile 大约一英里.
That's about right.大致不差.
That's about (the size of) it.就是那么一回事； 大概如此.
It is about finished 差不多要完成[终结].
2.周围,四面； 到处.Look about 四顾.
3.活动；盛行,到处散布,传布.
The news is going about.消息正在传开.
4.绕着,围着,倒转,掉转.
Round about 掉转,回头,倒过来.
The wrong way about 相反,倒转过来.
5.附近； 在附近
Is the manager about 经理在吗?
There is no one about.附近无人.
6.(接带 to 的不定式) 将要.
前置词
1.在…周围.About the neck 绕着脖子,围在颈上.
2.在…附近,在…身边,手头.
Somewhere about here 在此地附近.
I have no money about me.我身边无钱.
3.前后,左右； 大概.About noon 正午前后.
4.对于,关于.
Talk about sb.谈论某人.
He is most particular about being conscientious.他最讲究认真.
5.从事于.
What are you about 你在干什么?
