含since的句子用过去完成时还是现在完成时

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• 关于完成与过去时态的问题句子：(1)I didn't realize what disaster I had brought to you until I had checked out what had heppened.(2)I have been working in Shenzhen for four years since I gruduated from university.我的疑问：1,在第（1）句中,until后为什么用的的是过去完成时I had checked out而不是过去时I checked out?2,在第（2）句中,since后为什么用的不是过去完成时I had grduated而是I graduated呢?其实我就是不懂过去时与过去完成时的用法,常常搞混.
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