waiting后接什么介词

后接介词for，例如：

1、I'm still waiting for confirmation of the test results.我仍在等待考试结果的通知书。

2、Students stood around in groups waiting for their results.学生们成群地站在周围等待成绩。

3、I was waiting for the right moment to ask him.我在等待时机问他这件事。