Pronouns are words that replace nouns. They are used to avoid repetition and make writing more concise. Examples of pronouns include:
* Personal pronouns: I, you, he, she, it, we, they
* Possessive pronouns: mine, yours, his, hers, its, ours, theirs
* Reflexive pronouns: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves
"Surface" is a noun. It refers to the outer layer or top part of something.
Let me know if you have any other questions about pronouns!