帮帮忙老大们英语改错

Last summer I went(过去式） to America(大写） and studied at a language
school.(句号）I had many wonderful experiences(正确，经历，可数） ，but I also
had a sad one ，one day a(泛指，用不定冠词a) school help party where
I was (被动语态）invited to talk about Tianjin after(小写） that they asked me a lot （去掉of，后面没有名词）.

last summer I went to america and studied at a language
school，I had more wonderful experiences ，but I also
had a sad one ，one day in the school help party where
I was invited to talk about Tianjin A fter that they asked me a lot of

last summer I WENT to america and studied at a language
school，I had many wonderful experience（无S） ，but I also
had a sad one ，one day the school HELD party where
I WAS invited to talk about Tianjin after that they asked me a lot of