When I was doing an exercise on tenses, I found this sentence:
I have not found my ring yet which I lost at the party yesterday.
My question is why we used present perfect? I asked some people and they told me that because of the word "yet", we used present perfect. But I need a reason, which leads me to better understanding of how to use tenses rightly. I think that it's better to use present continuous because the person who is lost his ring is keep looking for it, and the action is continuing, How much is that correct?