Conditional sentences are saying that you think an action will happen if another action happens.
The Present Real Conditional is used to talk about your normal actions in real situations.
Both "if" and "when" are used with the Present Real Conditional. Using "if" suggests that something happens less frequently. Using "when" suggests that something happens regularly.
*The present tense is highlighted in each sentence.
1. When I go to the movies, I like to buy popcorn.
2. If it rains, I use an umbrella.
3. When I go to the store, I buy food.