certainly not用在什么地方

可用在句中或句末，例如：

1.He's very attractive, though certainly not a ladykiller他很有魅力，雖然還不至于使女人一見傾心。

2.The students were certainly not wanting in enthusiasm.學生們當然不乏熱情。

3.Doing it once was just about excusable ─ doing it twice was certainly not.這種事干一次也許還可以原諒，干兩次就絕對不能了。