Hi Nolan,
I would love to add, that for "ОНО" the verb will end at "О". For example, оно светилО, оно смотрелО.
You can use the ending "ете" if you have a formal conversation or you are talking to the person with the title (for example you are having the conversation with the professor). In this case you will use "ETE" or "ИТЕ" : "Как Вы полагаЕТЕ?" , "МожЕТЕ ли Вы мне помочь?".
I hope it will help :)