重点讲解：
1. all the time 一直；始终；
They rowed all the time.
他们总是争吵不休。
2. depend upon 取决(于)；有赖(于)；
Your success will largely depend upon what you do and how you do it.
你能否成功将首要取决于你做什么和怎样做。
3. every now and then 不时；有时；偶尔；
Every now and then light clouds floated across the sky.
天上时而飘过几片薄薄的白云。
4. stay up 深夜不睡；熬夜；
With so much homework to do, I will have to stay up late tonight.
有这么多作业要做，今天晚上我得熬夜了。

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