waiting是什么詞性

　　例句：

　　1、 I was waiting for a bus.

　　我在等公共汽車。

　　2、He had been patiently waiting in the anteroom for an hour.

　　他在前廳耐心地等了一個(gè)小時(shí)。

　　3、I'm still waiting for confirmation of the test results.

　　我仍在等待考試結(jié)果的通知書。

　　4、There are a lot of people back there waiting to get in.

　　后面有許多人等著進(jìn)來。

　　5、Students stood around in groups waiting for their results.

　　學(xué)生們成群地站在周圍等待成績(jī)。