分类：教育/科学-外语学习
问题：请问个英语问题providingmeaningfulandqua 
viding meaningful and quality input onto the virtual classroom is an essential part of online learning.主语是is之前is位于后面是宾语对吗input是什么请说明句子结构
回答：input(n.) 输入;投入
主语：providing meaningful and quality input
定语：onto the virtual classroom 
谓语：is
宾语：an essential part of online learning.