what are these能说成what are they吗 They are …… 和 These are 都能用吗

what are these能说成what are they吗 They are …… 和 These are 都能用吗 --What are these?--they are some__of__. What are these?然后They are schoolbags.和Are these cakes?把前面的变成 What are these?回答为什么是They are …,而不是These --What are these?--They're watchs.改错 What are these?They are_______.(橘子) what are these ? These are ( )? what are these用these are...回答可以吗?还是说一定要用they are来回答 what are these?怎么回答?是用they are 为什么? What shape are these clocks?They are circles.的中文 What are these girls?They are my cousins.【改错】 为什么用What are these?提问 用They are...为什么?