it's reported that two schools ,both of which are being built in my hometown ,will open next yearboth of which为什么不用both of them?

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it's reported that two schools ,both of which are being built in my hometown ,will open next year
both of which
为什么不用both of them?

把两个逗号中间的句子去掉以后,头尾两段形成一个完成的句子.这说明,中间那段不是句子,是一个从句,定语从句,修饰two schools.定语从句有定语从句的用法,two schools是先行词,which是引导词,因为有both of 这个介词短语在,所以不能用that.扯远了,你可以找本书详细研究下定语从句.

which are being = 都在 ( 差不多是这意思)
希望有用 =)

both of which are being built in my hometown 定语从句在这里是two schools的定语。所以必须有关系代词which.