So I'd like to write some basic rules concerning the short form of adjectives: Russian adjectives have long and short form. To be more precise, only qualitative adjectives may have both long and short forms (лёгкий - лёгок, красивый - красив). In today's conversational Russian the usage of long adjectives if preferred. However, you will most likely have to use the short form of an adjective in the end of a sentence. For example: Эта комната занятая.-long form Эта комната занята.(This room is occupied.)- short form Short adjectives usually describe temporary qualities, as opposed to long adjectives that refer to constant and general qualities. For example, we say: Ольга -счастливая девушка.(Olga is a happy girl.) - constantly Вчера вечером она была очень счастлива.(She was very happy last night.) - temporarily Short adjectives can also refer to qualities with respect to a particular person, thing or circumstances. For example: Папин костюм сыну велик. (The father's suit is big for the son.) Some Russian adjectives do not have a short form.