“介词+关系代词”引导的定语从句 关系代词在定语从句中作介词宾语时，从句常常由 “介词+关系代词”引出。 The school (which / that) he once studied in is very famous. The school in which he once studied is very famous. Tomorrow I’ll bring here the magazine (which / that) you asked for. Tomorrow I’ll bring here the magazine for which you asked. This is the boy (whom / who / that) I played tennis with yesterday. This is the boy with whom I played tennis yesterday.