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