How long has it been since this company was established?since this company was established?是表语从句?
问题描述：
How long has it been since this company was established?
since this company was established?是表语从句?
答
时间状语从句.你没有理解表语从句
表语从句,如the news is that .
当从句在be动词后的时候,才是表语从句.