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，虽然还不至于使女人一见倾心。
2.The students were certainly not wanting in enthusiasm.学生们当然不乏热情。
3.Doing it once was just about excusable ─ doing it twice was certainly not.这种事干一次也许还可以原谅，干两次就绝对不能了。
