What is a...

Verb- 'A verb asserts something about the subject of the sentence and express actions, events, or states of being. The verb is the critical element of the predicate of a sentence.'

Adjective- 'An adjective modifies a noun or a pronoun by describing, identifying, or quantifying words. An adjective usually precedes the noun or the pronoun which it modifies.'

Noun- 'A noun is a word used to name a person, animal, place, thing, and abstract idea. Nouns are usually the first words which small children learn.'

Pronoun- 'A pronoun can replace a noun or another pronoun. You use pronouns like "he," "which," "none," and "you" to make your sentences less cumbersome and less repetitive.'

Subjective Personal Pronoun- A subjective personal pronoun indicates that the pronoun is acting as the subject of the sentence. The subjective personal pronouns are "I," "you," "she," "he," "it," "we," "you," "they."

Adverb- 'An adverb can modify a verb, an adjective, another adverb, a phrase, or a clause. An adverb indicates manner, time, place, cause, or degree and answers questions such as "how," "when," "where," "how much".

http://www.writingcentre.uottawa.ca/hypergrammar/