idon'tknowtheboykitesinthesquareatall(答案是flying,为什么不是isflying)listen,therearemanystudentswhothequestionintheclassroom(答案是arediscussing,为什么不是discussing)

Question

i don't know the boy __kites in the square at all(答案是flying,为什么不是is flying)
listen,there are many students who___the question in the classroom(答案是are discussing,为什么不是discussing)

Answer 1

flying 是属于现在分词作定语,因为句子已经有了谓语动词 don't know ,简单句不可能有两个动词.
who 引导定语从句,are discussing 作从句的谓语部分,如果不要are ,discussing 现在分词不能独立作谓语.