students learn their lessons in class.In class teachers teach them..

问题描述:

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

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.