run-on sentences：句语句之间没有衔接sentence fragments：句子成分缺失dangling modifiers：悬垂结构illogical or faulty parallelism：平行结构不一致unnecessary shifts in point of view：语义切换没有必要的过...有例子吗？很想知道清楚一点，加分晚了，明天吧按顺序编一个paragraph：
Ciao li is my best friend , he helps me a lot . One day ,having a problem in my homework ,he volunteered to offer help (分词悬垂结构），so the problem was not only solved but also I knew how to deal with the similar questions(平行结构不对称）. Good friends can't build up on money ;(on the contrary )语义切换 a friend in need is a friend in deed.