before用作介词时,后面可接名词及名词性词组(含动名词及动名词词组), 故before bedtime和before going to bed都是对的。before用作连词时,后面应跟从句,这时从句中的主语应与主句中的主语相一致。比如,Mike always brushes his teeth before he goes to bed.
before用作介词时,后面可接名词及名词性词组(含动名词及动名词词组), 故before bedtime和before going to bed都是对的。before用作连词时,后面应跟从句, 从句中不能缺少主语。比如,Mike always brushes his teeth before he goes to bed.