A: In the phrase “whether or not,” the “or not” is often optional. When the choice is up to you, you can generally use either “whether” or “if.” But you definitely need “or not” when you mean “regardless of whether,” as in, “I'm out of here whether you like it or not!”

How do you use whether or not in a sentence?

Examples. “I couldn't decide whether I wanted to eat a cheeseburger or not.” “Whether I was going to the movies or not, I probably needed to put on clothes.”

What does it mean to say whether or not?

used for saying that it is not important which of two possibilities is true: Whether or not you like it, I'm going out tonight. Whether he wants to or not, he'll have to clean his room.