Agreement

Definition: When words have a grammatical relationship which affects the form of one or more of the elements then they agree. We can also say that Agreement is a form of cross-reference among all parts of a sentence.

Note: Agreement is also known in some texts as Concord

Some of the most types of grammatical agreements are:

Grammatical person: Example: You are VS she is.
Grammatical number: Example: One cat VS Ten cats.
Grammatical gender: Example: Jose loves his girlfriend VS Maria loves her dog.
Grammatical case: Example: I played with you VS She played with me.

The following example will teach us to understand in a better way this important topic.

Example:

Five Cows
Five Cows shows agreement because the Noun has the Plural Inflection, which is required by the Number. It is another way of saying Concord.

Twenty cats
In this example, twenty cats shows agreement because the Noun has the Plural Inflection, which is required by the number.