1.for a while ：for a period of time暫時；片刻；一會兒
*Wait for a little while,as I shallbe back in a few minutes．等一會兒,因為我馬上就回來.
*Let's rest for a while．讓我們休息一會兒.
*Why don't you lay that difficult math problem aside for a while 你為什么不把那道數(shù)學(xué)難題暫時放一邊呢?
2.after a while 過一會兒,不久后
After a while,these people cooled off towards me.
過了一會兒,這些人對我態(tài)度冷淡了.
After a while,driving becomes second nature to you.
過不多久,開車的動作就像本能的反應(yīng)一樣了.
3.once in a while 偶爾,有時
occasionally；now and then有時；偶爾
*We go for a picnic in the park once in a while．我們有時去公園里野餐.
*Once in a while the puppy would run away．小狗有時也會溜出去.
4.all the while 一直,始終
He sang all the while they walked home.在他們回家的路上,他一路走一路唱.
We waited for three hours,all the while hoping that someone would come and fetch us.我們等候了三個小時,一直希望能有人來接我們.