A sentence is the expression of a complete thought.
A sentence needs a subject and a verb to make a complete thought.
A subject is a person or thing that completes an action.
A verb is an action.
Look at this example of a complete thought:
Bob drives a truck.
Bob is the subject who does something.
The action is drives a truck.
Here are more examples of a complete thought with a subject and a verb:
The dog barked.
John rode his bike.
Mom is talking.
A sentence is a complete thought that contains a subject and a verb.
It’s your turn: Find the subject in this sentence. The class took a field trip. Did you figure out who is doing something? Good for you!