notatall/not…atall

Ⅰ.not at all 是客套话，意为“别客气”相当于 That’s all right; You are welcome. 如：①--Thank you very much.–Not at all.

Ⅱ.not…at all “根本不”;“一点也不”。at all 用以加强语气。如：

① She doesn’t like it at all. 她根本不喜欢它。

② He didn’t come at all.他根本没来。