- A simple sentence is a sentence that expresses only one complete thought.
- A compound sentence is made up of two or more simple sentences joined by a
conjuction such as and, or, or but. - Use a comma (,) before a conjunction that joins two sentences.

The watermelon is gigantic.
The watermelon is

Is the elephant big?
Is the elephant big, or is the zebra small?

I like to eat pasta.
I like to eat pasta, but