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but people have changed the reasons why they keep dogs as pe

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but people have changed the reasons why they keep dogs as pets.
从句不是要使用陈述语序吗?为什么这句子是keep而不是kept?原因!
but people have changed the reasons why they keep dogs as pe
答:从句用的正是陈述语序啊:主语:they,谓语:keep 宾语dogs,状语as pets
用keep不用kept是因为,这讲的是一般情况,并不是过去的事情.
再问: 什么是现在完成时啊,简单点行吗?
再答: changed是过去分词不是过去式,没看见前面有助动词have吗,这两个合在一起构成现在完成时态。属于现在时态。