about用在句尾吗

可以,
about 有以下意思:
（prep.）
1.关于:
what are you talking about?
2.在……周围,围着:
Everything about me was so beautiful.
3.在……范围内
After tea I wandered about the town.
4.在……附近一带，在身边
She likes to have her children about her.
(adv.)
1.到处，四处
I used to going about alone.
2.在附近
Is Henry about?
3。在（向）四周
All about was the white snow.
4.大约，大概（表示年龄、数量、长度等）
She is about fifty.
5.差不多
I've about finished .

What are you about?
你在干什么?
习惯用语
作副词时都含“四处”、“遍地”的意思about 系常用词, 如
look about 四处看。

可以，一般是用于疑问句，如 what are you talking about?

可以啊、比如what、are、you、thinking、about

一般用在句中，也可跟疑问词连用，用在句首。