at all 是不是有两个意思？

1. at all用在否定句中:
1) not...at all=not a bit 根本不
如: I'm not hungry at all.
2) Not at all. 不用谢/没关系
如: Thanks. Not at all.
I'm sorry. Not at all.
2. at all用在疑问句中,表示"到底,究竟"=on earth
如: Did you sleep on the plane at all?
3. at all 用在肯定句和条件从句中,表示"居然,竟然；既然"
如: If you want to do it at all, do it well.
He is very lazy, but he passed the exam at all.
4. after all 才是"毕竟；终究"的意思(楼主记混了)

1.not ...at all 一点也不 eg:I don't want to sleep at all
2.表强调 一般用于句末
3.not at all 不用谢

我觉得用中文翻译不好说，但我理解的比较倾向与第个举两个例子吧
1我根本不会游泳：I cant swim at all

1 表强调 一般用于句末
2 not at all 不用谢/一点也不

是啊