句子(1) I have many friends .
句子(2) I am going to send postcards to many friends.
把句子(1)和句子(2)合并为1个并列句就是下面句子
I have many friends and I am going to send postcards to them.(them指代前面名词短语many friends)
把句子(1)和句子(2)合并为1个定语从句就是下面句子(send sb sth=send sth to sb)
I have many friends whom I'm going to send postcards to (关系的代词whom代替先行词many friends并在定语从句做介词to的宾语)
如果把后面介词to移到关系的代词whom前面就构成to whom结构了,也就是下面的句子
I(主语)// have(谓语动词)// many friends //(宾语)//to whom I'm going to send postcards(修饰宾语定语从句)
特别备注:如果把介词to移到关系的代词前面,只能使用whom, 如果介词不移到关系代词前面,关系代词还可以使用who。
(1)I have many friends and I am going to send postcards to them.(并列句)
(2)I have many friends who I am going to send postcards to .(正确)(定语从句)
(3)I have many friends to whom I am going to send postcards (正确)(定语从句)
以上三个句子都是正确的。
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