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。
举个例子给你
One day I met you.(有一天我遇见了你)
I love you ever since.(从那时起我就一直爱你，直到现在，但没有人可以预言我以后会不会爱你，总之到现在为止，我很爱你)
I swear I will love you since ever.(我发誓我会从此一直爱你,直到地老天荒)
感受到区别了吗
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