These are old dresses.(单数句)
are these old coats 改为单数句
These are old buses.的单数句
These are some old photos.改为单数句
()dresses are these
these toothbrushes are new.改单数句
Are these nice pictures 改为单数句
are these your erasers?改单数句
are these men doctors 单数句
these shoes are ours.单数句
These are his brothers 改为单数句
These are my horses改单数句
These are yellow purses.(改为单数句)