He kicked the snow off his shoes before getting inget为什么要用现在分词形式

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Hekickedthesnowoffhisshoesbeforegettinginget为什么要用现在分词形式Hekickedthesnowoffhisshoesbeforegettinginget为

He kicked the snow off his shoes before getting inget为什么要用现在分词形式
He kicked the snow off his shoes before getting in
get为什么要用现在分词形式

He kicked the snow off his shoes before getting inget为什么要用现在分词形式
before是介词呀,介词后接动词的话,要用动词的分词形式.

因为before是介词,介词后本应加分词。