病句改错：What are they?they are boxs

病句改错：What are they?they are boxs What are these?They're boxs.这句话错在哪里? ----what are they from?----They are from America.改错 改错What do they want to are? --What are these?--They're watchs.改错 what are they usually do?改错 改错 :What are this?They're pinapples. Who are they They are teachers.(改错 What are these girls?They are my cousins.【改错】 what are they 和 what they are what are they doing now? They are--- what are they are pens