题目内容：

in a while一般用于句首、句中还是句末?还有after a while和for a while 呢?

优质解答

in a while句末例句：I will leave for Beijing in a while(我马上就去北京）after a while句首例句After a while,we began to have a picnic.过不久,我们就开始野餐for a while 也是句末例句I have watched TV for ...