The boy keep to run on the playground after classWhen we look at the great wall ,we can't help to think about our chinese peopleYour were too tired you could stop having a restYou can go out to play when you finish to do your homework I want go,what about you?五句话 就挑语法错误

The boy keep (running) on the playground after class
When we look at the great wall, we can't help (thinking) about our chinese people
Your were too tired you could stop (to have) a rest
You can go out to play when you finish (doing) your homework
I want (to go), what about you?
都是动词不定式和分词的运用。

The boy keep running on the playground after class
When we look at the great wall ,we can't help thinking about our chinese people
Your were too tired you could stop to have a rest
You can go out to play when you finish doing your homework
I want to go,what about you?

The boy keep (running) on the playground after classWhen we look at the great wall ,we can't help ( thinking) about our chinese people(You) were too tired you could stop ( to have) a restYou can go ou...

to run 改为on running
to think改为thinking
you could 改为to
to do改为doing
go改为to go
希望能帮到你，有不明白的可以再问，祝你学习进步！
望采纳,谢谢~~