高手帮忙改英语作文It is very necessary to be a good university studend.Good university students is the foundation of the construction of the motherland.If you didn't want to be a good student you will lose the best opportunity to study.How to be a good university student?There are several prerequistes to be a good university student:good character,study hard,health body,etc.What I will do in the future is as follows.I'll help anybodywho need help.I'll cherish

It is essential to be a good university student.Due to that is the foundation of constructing my motherland.furthermore .If you didn't decide to be a good student that you would lose the opportunity to study.
How to be a good university student?There are several prerequisites such as personal character，the attitude of your study,did you have a healthy body,etc.
I would try me best to help someone in the future.i am appreciate this chance to study.
I play basketball twice a week ,so I am in a good shape.

你的文章有单词错误和语法错误,修改如下:
It is very necessary to be a good university student.Good university students are the foundation in the construction of the motherland.If you don't want to be a good student you will lose the best opportunity to study.
How to be a good university student?There are several prerequistes :good character, hard-working and healthy body etc.
What I should do in the future are as follow:I'll help anybody
who needs help.I'll cherish the chance to study.I will play basketball twice a week ,so that I needn't to worry about my health.

在你的基础上改一些错的地方,当然,在句子结构和样式多样上还需要下功夫.好的文章不是用的词多,而是用了恰当的词
It is very necessary to be a good university studend（student).Good university students is (are)the foundation of the construction of the motherland.If you didn't(don't因为你讲的是一个客观的事,不是指过去） want to be a good student you will lose the best opportunity to study.
How to be a good university student?There are several prerequistes（这个好像写错了吧,可以改为factors) to be a good university student:good character,study hard(并列几个名词词组,可以用hard study）,health(healthy) body,etc.
What I will do in the future is as follows（following).I'll help anybody
who need(needs) help.I'll cherish this chance to(of,珍惜学习的机会） study.I(will) play basketball twice a week ,so I don't worry about my healty（health).

第一句中 university studend应该改为university student
health body 应该改为 healthy body
who need help 应该改为 who needs help 前面是不定代词,所以应该用第三人称单数
最后一个词healty 应该改为 health,是不是楼主打错了啊?呵呵
还有 There are several prerequistes to be a good university student 这一句中的 to be a good university student可以省略，因为全篇已经过分的强调了，所以显得累赘
其它的都还可能，没有什么错误