Are these your cousins改为单数形式
Are these your cousins改为单数形式
are these your books?改为单数形式
Are these your brothers 怎么改为单数形式?
this your friend?(改为复数形式) 问题二Are these your books?(改为单数形式) '
these are new books.改为单数形式
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are these apples?改为单数形式
Are these sheep怎么改为单数形式
These are English books.改为单数形式
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These are apples改为单数形式