i don't know the boy __kites in the square at all(答案是flying,

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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)

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.

-Don't you know our town at all?-No.This is the first time I I don't know the boy ____short straight hair.Who is he?A.in I don't know the boy ___ withes shoes. 连词成句the,read,in,don't,library,pleasebiack,all,like,i,at,don' I don't know the professor * at the meeting tomorrow I was in a strange city and i didn't know the city at all.an I was in a strange city and Ididn't know the city at all i don't know what she___ (do)at the moment 1.I don’t know the boy ____ glasses.这个介词填with还是填 in?2.I like The dish ____terrible!I don't like it at all. I don't konw the boy ()the coat 1.in 2.at 3.with 4.of Who's the boy in red?Sorry,I don't know＿＿.＿＿＿is a new studen