她以前经常在笔记本电脑前工作到凌晨4点钟。
我们预计十点钟以前结束。
她知道八点钟以前那儿的东西都很便宜。
She knew that everything was cheap there before eight o'clock.
我最迟应该在8点钟以前到家因为我不想让父母担心我。
I should be home by 8 o'clock at the latest because I don't want my parents to worry about me.
我七点钟以前恐怕抽不出身来。
I'm afraid I'll be tied up until 7 o 'clock.; I'm afraid I won't be free until 7 o 'clock.
可是现在，因为我年龄大了，也比以前更懂事了，每当我在晚上11点钟爬进被子里时，我就想起了我妈所说的话。
However, now older and wiser, I remember my mother's words as I scramble into bed at 11 o 'clock.
允许她早上看电视，但10点钟以前必须关掉电视，接下来的整天都不能看。
I let her watch TV in the mornings, but we try to turn it off by 10 a.m. for the rest of the day.
她要七点钟备好茶点，这样她八点以前就可以出门了。
仅仅在半点钟以前，他们已经讨论过许多有关个人的问题了，现在他们这种客套似乎有点儿多余。
As they had been discussing a score of personal matters only half-an-hour before, the introductory style seemed a little superfluous.
你必须在今天下午4点钟以前完成任务。
我必须在五点钟以前把它交上去吗？
傍晚常常出去溜达一会儿，并且总是在7点钟以前回来。
He usually takes a short walk in the evenings and is always home by seven o 'clock.
你能在五点钟以前做完这工作吗？
到昨天下5点钟以前，他们已经完成了工作任务的一半。
By 5 p. m. yesterday they had already done half of the work.
你必须在六点钟以前来这里。
参观大概要一个半小时，3点钟以前回到这里。
The tour will take about an hour and a half. We ought to be back here by 3:00.
在十点钟以前，我们已经到达了车站。
我料想他六点钟以前会完成这项工作。
我真希望他回家去。我从来没有在三点钟以前睡觉过。那是个什么样的睡觉时间呀？
I wish he would go home. I never get to bed before three o 'clock. What kind of hour is that to go to bed?
我从来没有在三点钟以前睡觉过。
你10点钟以前一定要回来。
我想他八点钟以前会回来。
他将在三点钟以前回来。
五点钟以前我们很难完成。
他们要求我们9点钟以前到达那里。
他们要求我们9点钟以前到达那里。
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