at all
1.(否定句)丝毫;根本
I don't like her at all.
我一点都不喜欢她.
2.(问句、条件句及肯定句内表示强调)究竟
He'll come before 12 if he comes at all.
如果他真的要来的话,肯定在十二点以前.
Is it at all possible that he alone can drink ten bottles of beer?
难道他真的能独个儿喝十瓶啤酒吗?
not at all
ph.
1.不要客气
"Thank you for your help." "Not at all."
"感谢您的帮助." "别客气."