同学你好，该知识点来自沪江网校《新概念英语1、2、3、4册连读标准会话【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
ever since是副词短语，意思是“打…以后一直”
I simply gave in to him, and I've regretted it ever since.
我就向他屈服了，从那以后我一直后悔。
A few years ago I was asked by a publisher to consider writing a novel, and the idea has been in cold storage ever since.
几年前，一位出版商要我考虑写一部小说，但之后这事就搁置下来了。

where he had remained ever since是定语从句。
其中remain的意思是“留下来，待在”
They have asked the residents to remain in their homes.
他们已经要求居民待在自己家里。

汉斯在一个距离50英里的小村庄里定居了下来，以后他就一直待在那儿了。

祝同学学习进步~