It seems that our teacher very happy today.
题目
It seems that our teacher very happy today.
还有We saw a lot of cars in the street.改为被动语态 My little sister used to be afraid of the dark.改为反义疑问句
答案
Our teacher seems very happy today A lot of cars were seen by us in the street My little sister used to be afraid of the dark,wasn't she?
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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