As the present continuousThe aspect expressing duration, formed with be + verb-ing. E.g.: What are you doing? for future expresses fixed arrangements, it would be strange to add conditions to such eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head.s. As the condition itself, however, we can use it without a problem.

If you are looking for Lucy, you’ll find her in the bathroom. (referring to a present action)
If you are staying for the weekend, we’ll go and see the new James Bond film again. (referring to a future arrangement)

First conditional and imperatives
First conditional First conditional and present perfect