Frequency adverbs like always, usually, often, sometimes, rarely, and never are used to describe how frequently something occurs. They can be used with forms of the verb "to be" to describe habits, such as "I am sometimes late for school" or with other verbs to describe actions, like "I never wake up late." Sequencing words like first, then, next, after that, and finally are used to describe the order of steps or events in a process or routine.