大学英语作文中常用的句式包括：
以单个修饰语作为句子的开头
例如：Young and ambitious, JieYu works hard to teach English.
以同位语作为句子的开头
例如：The most popular teacher in Neworiental, Ma Zihui, will attend the party.
以短语修饰语作为句子的开头
例如：With a book in her hands, Fang Meng talked to a foreigner.
提出问题或现象的句型
例如：Nowadays, it is common to hear/see people using smartphones while walking.
阐述不同观点的常用句型
例如：Although more and more people come to believe that climate change is a serious issue, there are still others who insist that it is not caused by human activities.
陈述个人观点/想法的常用句型
例如：In my opinion, both sides are partly right in that they have valid points, but they also have some flaws.
用于句首的常用句型
例如：As far as education is concerned, the government should invest more resources in rural areas.
强调句
例如：We cannot emphasize the importance of education enough.
倒装句
例如：Here comes the bus!
并列句型
例如：Not only is the weather cold, but it is also windy today.
名词性从句
例如：What he said surprised everyone present.
定语从句
例如：The book which is on the table is written by Mo Yan.
状语从句
例如：If it rains, the match will be canceled.
这些句式可以帮助你在写作中更加流畅地表达思想，使文章结构更加清晰和有力。建议你在写作练习中多使用这些句式，以提高自己的写作水平。