Ever since he was hit by a car, he has walked with a limp.

请问老师前面是Ever since 引导的时间状语从句吗？

是的。又如：

I have known him ever since I was a child.我自孩提年代起就已经认识他了。
Ever since he lost his job, he has been looking rather down at the heels.从他失业以来, 他的样子一直那样邋遢。