What is in a sentence?

A sentence is a group of words that expresses a complete thought. It typically contains a subject (who or what the sentence is about) and a verb (what the subject is doing or being).

Here's a breakdown:

* Subject: The person, place, thing, or idea the sentence is about. Example: "The cat"

* Verb: The action or state of being of the subject. Example: "slept"

* Object: The thing or person that receives the action of the verb. Example: "on the mat"

Example sentence: The cat slept on the mat.

Important Notes:

* A sentence must begin with a capital letter and end with a punctuation mark (period, question mark, or exclamation point).

* Sentences can be simple or complex.

* Not all sentences follow the exact "subject-verb-object" structure, but they must always express a complete thought.