the children come home from school,they arrive home early.Mr.Sawyer comes home from work,
题目
the children come home from school,they arrive home early.Mr.Sawyer comes home from work,
he arrives home late.
为什么前一句不加S后一句加了S
答案
前同孩子们是复数不可以加S
后面Mr.Sawyer 是三人称单数所以加S
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．
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