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初中英语 they weren"t fight each other but were playing together

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初中英语 they weren"t fight each other but were playing together at this time yesterday 中
为什么有but were 为什么有were呢
he isn"t my borther but my friend中 就不是he isn"t my borther but is my friend呀 but什么时候要加be动词 什么时候不用加阿
初中英语 they weren
he isn"t my borther but my friend 因为这是连接表语成份.
and /but/ or 接表语成份时,就可以省略很多.
Is it an apple or banana?
That is good and sound .
they weren"t fighting each other but were playing together
这是两个谓语成份,相当于并列句,省了主语.
再问: 并列句可以省主语 还可以省什么? 连接表语成份 还可以省什么?