Hi! Your conclusions about the aspects are absolutely correct. I'd like to add smth to make it more clear. Imperfective: 1. Can be used in the Past, Present and Future. 2. Use it when you speak about any kind of process, or actions that were/are/ will be happening at the same time. (Мы гуляли, разговаривали и смеялись) 3. Use it when you tall about the routines (Каждое утро я читаю новости и пью кофе) Perfective: 1. Can be used in the Past and Future. 2. With perfective forms we talk about the results of someone's actions, or desire to do something/ "to achieve any result". Я хочу завести собаку 3. If you use a sequence of perfective forms, it means that the actions happened one after another. Мы пошуляли, послушали музыку и поужинали. 4. Use it when you tall about one-time actions. Я уже посмотрел этот фильм You can use both to form an imperative. It depends on a situation. If a mother says Убери в своей комнате, it means she is waiting to see the result of her child actions. But if she says Пока нас с папой нет дома, делай, что хочешь: играй на компьютере, ешь мороженое..., there's no connection to any certain result. Most of the verbs in Russian have perfective forms. Now I can think of only one verb which actually doesn't...it's быть:)