I have always wondered whether it is allowed to mix tenses in one sentence in english(- and in my native language, danish), which can be quite embarrassing, when the need arises!?
Yesterday, I saw a dead cat, it is on the roof. (somehow, I know that it is still there. Is mixing allowed?)
Yesterday, I saw a dead cat, it was on the roof. (it has been removed. No problem)
Yesterday, I saw a dead cat, it ??? on the roof. (I do not know, if it is still there. What to do?)
Last week, I met my uncle, his name is Zymowch (Yes - he is still alive.)