students learn their lessons in class.In class teachers teach them..
题目
students learn their lessons in class.In class teachers teach them..
Student sit in the classroom[listening] to the teacher.为什么用listening
答案
students learn their lessons in class.In class teachers teach them..
Student sit in the classroom[listening] to the teacher.为什么用listening
因为listening是【现在分词】,listening to the teacher在此是【现在分词短语】做【伴随状语】.即：listening是伴随sit这一动作同时发生的动作.
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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