这个问题很大，不是一两句话能说清楚的。如果简单的说我是...的话，有几种说法：1. My name is ....2. I am ....如果要说明身份的话，可以说：I am from....I came from．．．其实初学英语的人应该看一部经典的英文电影，The Sound of Music/音乐之声.那里面有很多值得学习的东西，比如介绍。
My name is###.I'm #years old.I come from China.There are #people in my family.They are my ##,my ##,......and my ##.My hobby is ###，### and###.I like English very much. I want to be a doctor in the future.
My name is XXX.I'm X years old.I come from China.My hobby is play baskeball and listen to music.I like English very much. I want to be a doctor in the future.
