作业帮before后加动词是吗形式?
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before后加动词是吗形式?
before后加动词是吗形式?
before后加动词是吗形式?
before后加动词是吗形式?
before可以用作【连词】和【介词】
用作【连词】时,后接【句子】.
用作【介词】时,后接【名词】或【动名词】.
如：Before he arrived, we had finished the work.(连词)
Before his arrival, we had finished the work.(介词)
Before going to bed, he had a cup of tea.(介词)
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