定语从句中的关系代词是做主语还是宾语是要看关系代词在从句中做得什么成分。如:
He is the very person that I am looking for.
关系代词that 在定语从句中做得是look for的宾语。如:
He is the person who gave me help yesterday.
关系代词who在定语从句中做得是主语,后面的gave 是谓语动词。me和help都是宾语。
关系代词有主格,宾格和属格之分,并有指人与指物之分。that的用法最广,that 可指人也可指物。见表:
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