There is always a very real chance that the condition will happen.
For example, you get up in the morning and plan to go for a run, but the sky is getting cloudy. It’s not raining right now, but you think it might rain later. What will you do? If it rains, I will stay at home.
We use the Present Simple tense to talk about the condition. We use will + base verb or modal + base verb or imperative to talk about the result.
We don’t usually use “will” or “won’t” in the “if” clause.
|If||I see Mary||I will tell her.|
|If||Tara is free tomorrow||invite her.|
|If||they do not pass their exam||their teacher will be sad.|
|If||she gets up early||she can catch the bus.|
|If||it rains tomorrow||what will you do?|
|I will tell Mary||if||I see her.|
|He will buy me lunch||if||he sees me tomorrow.|
|They can visit the pyramids||if||they go to Mexico.|
|Stay at home||if||it rains tomorrow.|
|What will you do||if||he doesn’t call you?|