How do you know if the pronoun agrees with it's antecedent. I am not sure what antecendent really means

An antecedent is the noun to which the pronoun is referring.

Jill painted her cousin's room yellow.
(The pronoun "her" is referring to "Jill" -- "Jill" is the antecedent for "her.")

http://grammar.ccc.commnet.edu/grammar/pronouns.htm

Additionally --

If an antecedent is singular, then the pronoun needs to be singular, too, as in the Jill/her example I gave you above.

If an antecedent is plural, then the pronoun needs to be plural, too:
The students need to have their textbooks with them during each class.
(The pronoun "their" refers to "students" -- both are plural.)

=)

The antecedent is the word to which the pronoun refers. In these examples, the pronoun is in italics and the antecedent is in bold.

Marilyn drank her glass of water in one gulp.

The boys gave their opinions about the new coach.

Mr. and Mrs. Standard bought the big house on the corner, and they plan to move in Saturday.

Pronouns must be of the same gender (male or female) and the same number (singular or plural) as their antecedent.

Check this site for more details.

http://leo.stcloudstate.edu/grammar/pronante.html

please see if this is right thanks :)

The question is in this sentence does the pronoun agree with the antecedent?

The waier refilled their glasses as they emptied it.

I said yes

To determine if a pronoun agrees with its antecedent, you must understand what an antecedent is. The antecedent is the noun or noun phrase that the pronoun refers to in a sentence. In simpler terms, the antecedent is the word that comes before the pronoun and gives it meaning.

To check if the pronoun agrees with its antecedent, you can follow these steps:

1. Identify the pronoun in the sentence. For example, in the sentence "John took his book to school," the pronoun is "his."

2. Find the antecedent, which is the noun or noun phrase that the pronoun refers to. In this example, the antecedent is "John" because the pronoun "his" refers to John's book.

3. Ensure that the pronoun matches the antecedent in terms of number (singular or plural) and gender (masculine, feminine, or neuter). For instance, if the antecedent is singular and masculine, the pronoun should also be singular and masculine. If the antecedent is plural and feminine, the pronoun should be plural and feminine.

It's important to note that some pronouns are gender-neutral, like "they" or "them." In such cases, the agreement is usually based on number rather than gender.

To further understand antecedents and pronoun agreement, it may be helpful to read examples and practice more sentences until you feel comfortable with the concept.