think twice before doing something 三思而后行
before doing sth 做某事之前
Before doing now what 以前干什么现在干什么
Before doing every thing 做每件事之前
Before doing prep school 上课之前做好预习
In Pisa before doing tasks 以前在比萨做任务
Before doing the HW 做功课以前
Before doing what now 以前干什么现在干什么
He thinks little before doing.
他做事很少考虑。
I advise you to make a plan before doing your homework.
我建议你在做作业之前制定一个计划。
The students were into four groups before doing experiments.
学生们在做实验前分成四组。
Doing this before arrival would give port officials time to try to identify suspicious activities.
VOA: special.2009.02.10
Of course, before doing so, he says, "you must call him first a tyrant."
当然,在叛乱或是弑君之前,你得确定你要诛杀的是一位暴君“
before he became really big when he was here in town doing his TV show,
在他大红大紫之前,他来这里拍电视剧,
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