I can't either distinguish or comprehend what 1. Imperfective (Indefinite), 2. Imperfective (Definite) and 3. Perfective Aspect mean. Here I'm only using the first person singular or maculine to have a quick and easier understanding. Please help me out by making a sample sentence after each verb below in both Russian and English. Really desperate to know. Present Tense Бегаю (Indefinite) Бегу (Definite) Past Tense Masculine Бегал (Indefinite) Бежал (Definite) Побежал (Perfective Aspect ) Future Tense Буду бегать (Indefinite) Буду бежать (Definite) Побегу (Perfective Aspect )