It is an apple tree?怎么改为复数句?

It is an apple tree?怎么改为复数句? this is an apple怎么改为复数句 There is an apple on the tree.(改为复数） this is an apple tree改为复数形式 that is an apple tree 改复数句 It is an apple改为否定句 That's an apple改为复数句 怎么改? 求音乐：there is an apple on the tree.(改为复数) It is an orange.(改为复数句) It is a red apple.改为复数句 is it an apple(改为否定句） 1.This is an apple tree.[改为复数形式] 2.Tony is [at schol].对括号里的提