while/'waɪl/

conj. during the time that sth is happening

n. [a ~] a short period of time

conj. 在…的时候；和…同时：John called you while you were out. 你出去的时候约翰打了电话给你。

◇Somebody knocked at the door while I was watching TV. 我在看电视时有人敲门。

n. [a ~] [S] 一会儿，一段时间：They talked for a while. 他们谈了一会儿。

◇Let's stay here (for) a while. 我们在这儿待一会儿吧。

音组-ile/-aɪl/

file; mile; pile; smile; while

常犯错误

✗ I was watching TV while he came in.

✓ I was watching TV when he came in. 我在看电视，这时他走了进来。

[✌while从句中的动词必须是持续性（be, wait, live等）的，而不能是短暂性（get up, arrive等）的，而且多用进行时]

辨析as; when; while