写出下列句子的复数形式
this is my book.
is that your sister?
that is my baseball.
is this your friend?
what's this in english?
人气：446 ℃ 时间：2020-04-12 17:52:13
解答
These are our books.
Are those your sisters?
Those are our baseballs.
Are those your friends?
What are these in English?
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