Pronouns are words that replace nouns. Some examples of pronouns include:
* I, you, he, she, it, we, they (personal pronouns)
* this, that, these, those (demonstrative pronouns)
* mine, yours, his, hers, its, ours, theirs (possessive pronouns)
"Shy" is an adjective, which describes a noun. It tells us something about a person's character.
For example:
* The shy girl (shy describes the girl)
* He was too shy to speak up. (shy describes he)