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[深化认知] 一、关系代词引导的定语从句 1．who, whom, whose引导的定语从句 (1)who和whom指人，who在定语从句中作主语；whom在定语从句中作宾语，在限制性定语从句中可省略。在口语中可用who代替whom。 Some people who are successful language learners often fail in other fields. 有些在语言学习上很有成就的人，在其他领域常常一无所成。 I have many friends to whom I'm going to send postcards. 我打算给很多朋友寄贺卡。 (2)whose指人或物，在定语从句中作定语，指物时常可用of which代替。 Children who are not active or whose diet is high in fat will gain weight quickly. 很少进行体育锻炼或饮食富含脂肪的孩子体重会增加很快。 2．that, which引导的定语从句 (1)that多指物，有时也指人，在定语从句中作主语、表语或宾语，作宾语或表语时可省略。指物时其用法和which大致相同，但也有区别。 (2)which指物，在定语从句中作主语和宾语，作宾语时，在限制性定语从句中可省略。另外，which可用来指代前面句子的部分或全部内容。 The boy was away from home for a week, which worried his parents very much. | 
