请看看这句英语语法有没有错误
题目
请看看这句英语语法有没有错误
I am not able to copy or burn the DVD.Because the DVD does not read and write,but it is able to play the movie.Maybe this DVD is in the protection of copyright.I am sorry to say I am not able to burn this DVD.
答案
应该改成：
I am not able to copy nor burn the DVD because the DVD is not writable. However, it is able to play the movie. This DVD is probably under the protection of copyright. I am sorry that I am not able to burn this DVD.
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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