the girl wearing a red sweater is my sister.为什么前面没有be动词还加ing?

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the girl wearing a red sweater is my sister.
为什么前面没有be动词还加ing?

wearing a red sweater 现在分词短语作定语=who is wearing a red sweater

wearing a red sweater 分词作定语修饰the girl 本句主语是the girl , is系动词 my sister.是表语 此句亦可改为The gilr who is wearing a red sweater is my sister , who is wearing a red sweater是定语从句修饰The gilr