Does Alice brush her teeth before going to bad?这里before 是连词还

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Does Alice brush her teeth before going to bad?这里before 是连词还是介词
为什么请帮我举个列子
连词：
介词：就用这句话做列子

这里是介词,因为before后面的动词用了ing型式.
只要它后面的动词是ing型式,那么前面这个就是介词.
要是连词的话,你可以这样说：
Does Alice brush her teeth before she goes to bad?

Does Alice brush her teeth before going to bad?这里before 是连词还改英语病句 Brush your teeth before you go to bad. your,go,before,brush,you,teeth,bed,to(连词成句） You should brush your teeth before ______ to bed. brush your teeth before you go to bed Brush your teeth before you go to bed.(翻译）英语连词成句1.you your teeth before to bed go brush.2.do what ofte How often does Candy brush her teeth? How often does candy brush her teeth does JENNY OFTEN HOW HER TEETH BRUSH. Yes,but remember to brush your teeth before you go to bed , Please brush your teeth ___(before,after)you go to bed.