抵达布鲁塞尔之前半个小时请通知我一声。
Please let me know half an hour before we arrive at Brussels.
在开始做作业之前，我们已经听了半个小时收音机。
Before beginning to do our homework, we had listened to the radio half an hour.
你应该在飞机起飞之前半个小时到那。
每天晚上睡觉之前听半个小时的英语。
Second, before you go to bed every night half an hour English listening.
在她叫我进去之前，我已经在外面等了半个小时了。
I had been ringing outside for half an hour before she called me in.
在她叫我进去之前，我已经在外面等了半个小时了。
I had been ringing outside for half an hour before she called me in.
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