Matching Pairs first conditionalOnline version First conditional by Andrey Parada Gómez 1 Future simple 2 Example of first conditional 3 Present simple 4 Structure of first conditional 5 First conditional If + present simple + future simple expresses a spontaneous decision, an assumption with regard to the future or an action in the future that cannot be influenced. For repeated or regular actions in the present time period. If it rains, I won't go to the park. It's used to talk about things which might happen in the future. Of course, we can't know what will happen in the future, but this describes possible things, which could easily come true.