Whether vs. If

In English, we often use “whether” and “if” when talking about possibilities or conditions — but they are not always the same.

When to Use Whether

Use “whether” when there are two or more choices. It's used to show alternatives, often with the phrase whether… or not.

• I don’t know whether I’ll go out or stay home.
• She hasn’t decided whether to apply for the job.
• Tell me whether you’re coming.

When to Use If

Use “if” for conditions — when one thing depends on something else. If A happens, then B happens.

• I’ll call you if I’m late.
• If it rains, we’ll stay inside.
• You can borrow my book if you return it tomorrow.