改写为被动语态肯定、被动语态否定和被动语态疑问
题目
改写为被动语态肯定、被动语态否定和被动语态疑问
We plant trees every year.
2、I sweep the floor at 7:00every day.
答案
Trees are planted every year.
Trees aren't planted every year.
Are trees planted every year?
The foor is swept by me at 7:00 every day.
The foor isn't swept by me at 7:00 every day.
Is the foor swept by you at 7:00 every day?
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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