who whom 都指代人.who 可作定语从句的主语和宾语,whom只作宾语.
作宾语时who/ whom都可以省略 .
当关系代词前有介词时,用介词+Whom 结构.如
He is the boy who came to our class yesterday
He is the boy (who / whom) I helped yesterday
He has a sister of whom he is proud
who whom 都指代人.who 可作定语从句的主语和宾语,whom只作宾语.
作宾语时who/ whom都可以省略 .
当关系代词前有介词时,用介词+Whom 结构.如
He is the boy who came to our class yesterday
He is the boy (who / whom) I helped yesterday
He has a sister of whom he is proud
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