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请教一个英语句子He has just bought a new house in the city,but ever

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请教一个英语句子
He has just bought a new house in the city,but ever since he moved in,he has had trouble with cars and their owners.请问那个ever since 而且怎么第一个逗号前面是现在完成式,而第二个逗号前又是一般过去式,然后最后一句话用的又是现在完成式?
since 自从……,ever强调 since 即自从……到现在,
but ever since he moved in,自从他搬进来.
一般since引导的句子用过去时,主句用现在守成时.