Zhang Dong is my best friend,（此处句号） he entered our class last semester. He is an excellent student,（此处句号） he not only （but also呢?）study well and friendly, humble（这两个都是形容词不能修饰study）. He has many hobbies, he likes pop music, also like classical music.（改为 for example pop music and classical music） There are three people in his family, (此处句号)he is the only child. His father is a doctor, （and）my(改为his) mother is an actress. He has a dream, is to be a lawyer. （此句改为 he dreams to be a lawyer）The teacher and classmates all like him. I also like him very much

楼主的问题主要在于 对句子之间如何连接的问题理解不清 造成总是在没有连词的情况下喜欢用逗连接句子 这样造成篇章混乱 另外对词性的理解方面也要加强

Last Saturday sunny weather. My mother and I went to the Zhen Hua department store shopping; we take bus No. 42, inside the car clean and tidy, the gentle and friendly; 10:30 arrives at the store, we strolled upstairs downstairs, bought a lot of food and clothing, I especially like the blue and white T-shirt and new athletic shoes; at noon, we go to the nearby restaurants. Lunch, although tired, but my mother and I enjoyed it very much.