-Who are these white birds?-They are Mr Green's.这句话哪里错了

-Who are these white birds?-They are Mr Green's.这句话哪里错了 "Who's books are these?""they are Tom's"这句话错在哪里 These aerphones are Lucy's.They are his.这句话哪里错了 Whose book are these They are him her Mr.Green's老师说的是 Mr.Gre Are these your trousers?Yes,these are.这句话哪里错了? who's jackets are these?整个句子哪里错了,正确的句子是 Who is are these pants.哪里错了 What are these?They're boxs.这句话错在哪里? these are my friend's CD's 哪里错了 How many are these white pants错在哪里 These are Lily's photo.哪里错了? Who are they?They are doctors.哪里错了,该如何改