Time expressions and the verb "to be" Present tense Tricky 3rd conjugation verbs Past tense and the imperfective future Past tense quirks and exceptions Aspect Aspect and adverbs Aspect and the imperative Imperative Verbs of motion Prefixed verbs based on isc Prefixed verbs based on jechac Verbs of motion: aspect Verbs of motion: past tense and imperatives "to know" po polsku "to be able": umiec vs. moc "to study" po polsku Adverb formation