the boy with his friends are watching TV now 改错
题目
the boy with his friends are watching TV now 改错
答案
The boy with his friends is watching TV now.
"The boy"是句子的主语,单数,谓语的时态要跟主语一致,就得用"is"."with his friends"只是作为主语的修饰语而已.
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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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