Definition: used to say that something will happen only after something else happens or is true Level: A2
如果明天下雨，我们就待在家里。
___If it rains tomorrow, we will stay at home.
如果你努力学习，你会通过考试的。
___If you study hard, you will pass the exam.
如果我有时间，我会给你打电话。
___If I have time, I will call you.
