Basic types of adverbs

In the section on adverbs, you learned about three basic types of adverb: manner, place and time adverbs. There are at least two more that are important. Frequency adverbs answer the question "How often?" about an action. Purpose adverbs answer the question "Why?". Here are some examples:

Type              Adverb        Example
Frequency      usually    Mika usually gets up early.
Purpose         for fun      I write computer programs for fun.

While the first example, usually, is a single word, the second example (for fun) is a phrase consisting of a preposition and a noun -- in other words, it is a prepositional phrase which functions as an adverb phrase.