Our next point is the first conditional. We use the first conditional to talk about future events that are likely to happen. Look at the examples. If the taxi doesn’t come soon, I’ll drive you myself. If the taxi doesn’t come soon is the future situation which is quite likely or possible. If you’re meeting her at three is the future situation which we also believe is quite likely. Now, let’s analyze the verb forms.  The verb in the if clause is in the present tense, the present simple in the first example, and the present continuous in the second example. Note that the present continuous is used in the second example because we are talking about a future arrangement. Future simple is used in the main clause.