请帮我检查一下这段英文的自我介绍是否有错.
题目
请帮我检查一下这段英文的自我介绍是否有错.
My name is Chenxinyi,(这里用逗号,所以后面小写）my English name is Zizi.I am from Tianjian primary school.I am 12 years old.There are five people in my family.I like guitar and singing.I will study hard in new school.
答案
I come from ...
I like playing the guiter...
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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