This is an orange(变成复数形式)

This is an orange(变成复数形式)
还有：
Are those boxes?（肯定和否定回答）
He hes big hands.（改成一般疑问句）
She is in class Two,Gracle seven.（从class到seven这部分来提问）
She is in class Two，Gracle seven.（从class到seven,就这部分提问）

These are oranges.
Yes,those are.No,those aren't.
Does he have big hands?
Which class is she in?