两个词组意思是一样的,用法有区别.
ever since后面可以不加任何东西,也可以加名词或者加从句.
例如：
I have never lied to him ever since.自那以后,我再也没对爸爸撒过谎.
Ever since 2000, he has lived there.自从2000年,他就住在那儿 .
Ever since he was 6,he has lived there.自从他6岁,他就住在那儿.
since ever 是副词,只能孤零零的放在句末,或者句首.
例如：
He has lived there since ever.=Since ever,he has lived there.从那以后,他就住在那儿.