1) When you are sure that something must happen or that something is true, you are certain. 2) When you are not happy, you are sad. 3) When you are quiet and peaceful, you are calm. 4) When you are sad because you are not with other people, you are lonely. 5) When you need to rest or sleep, you are tired. 6) You are nervous/anxious when you worry about what might happen. 7) When you are greater in height than the average person, you are tall.