指出句子错误并改正.
题目
指出句子错误并改正.
1.I is writing a report here.
2.Wu's sister aer eat over there.
3.Where are Zhang Peng?
4.John are very busy today.
5.Mary is dothe dish now.
答案
1.is改为am
2.eat改为eats
3.are改为is
4.are改为is
5.do改为doing
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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