They like playing the violin.I am a teacher.He is a king.There is a park over there.
题目
They like playing the violin.I am a teacher.He is a king.There is a park over there.
The boys point at the dog.
We make a cake at the weekends.
同样写出过去式
答案
They liked playing the violin.
I was a teacher.
He was a king.
There was a park over there.
The boys pointed at the dog.
We made a cake at the weekends.
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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