老师你好，这是一篇短文改错，为什吗这样改我不会，请老师帮忙帮我著明解析，谢谢
MAY10.2007
Today I WAS having a PE lesson while I fell down while改为when
and hurt my foot, I was in greatly pain at that moment greatly该为great
but I tired to act as if nothing has happened until the has该为had
class was over , though I had difficulty walk back to walk该为walking
my classroom , Istill did not tell anyone but even refused but该为and
the offer of help of my classmates , As result, the hurt as前加a
in my foot because worse , Now I know Iam wrong, we 正确
can tell others our need for help and accept his help his该为their
some day we can not help others in return, In this way not去掉
we can get along to each other happily ang peacefully to该为with
顺便问一下peacefully什吗意思

Today I WAS having a PE lesson while I fell down while改为when
1.when表示瞬时，while 表示延续性的词。
and hurt my foot, I was in greatly pain at that moment greatly该为great
2。。这里应用形容词，be in +形容词。
but I tired to act as if nothing has happened until the has该为had
3过去的过去用过去完成时。
class was over , though I had difficulty walk back to walk该为walking
4back to doing.
my classroom , Istill did not tell anyone but even refused but该为and
5此处表并列不表转折
the offer of help of my classmates , As result, the hurt as前加a
as a result结果。是一个固定搭配。
in my foot because worse , Now I know Iam wrong, we 正确
can tell others our need for help and accept his help his该为their
是他们的帮助，因为帮助的人有很多。
some day we can not help others in return, In this way not去掉
根据意思判断。
we can get along to each other happily ang peacefully to该为with
get along with固定
顺便问一下peacefully什吗意思
意思是平静地安静地很安宁地（副词）