these aren't their brothers改为单数句 jack is my brother's good friend.改为一般疑问句,并做肯定回答
is this your sister 改为复数句
人气：141 ℃ 时间：2019-08-20 05:11:58
解答
This is't his bother.
Is Jack your bother's good friend?-Yes,he is.
Are these your sisters?
英语要好好学啊……
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