Open sentence

Okay kiddo, do you remember when we learned about sentences? A sentence is made up of words that tell us about something. Now, an open sentence is a special kind of sentence that doesn't give us all the information we need to understand it right away.

Let's say we have a sentence like "Tom has ____ apples." Do you know how many apples Tom has? No, because there's a blank space that we need to fill in to make it a complete sentence. We call that blank space a variable, which means it could be any number of apples.

So, an open sentence is a sentence that has at least one variable in it that needs to be filled in to make sense. It's like a puzzle that we need to figure out by finding the missing pieces. Isn't that cool?