If one eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head. depends on the completionA concept, related to the perfect aspect, expressing that an action has finished. E.g.: He’s finished university. of another, we can use the present perfectThe aspect expressing completion. E.g.: He’s finished university. tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. in the if-clauseA group of related words containing a subject and a verb..

If you’ve finished, (then) we’ll go.

First conditional and present continuous
First conditional The difference between the zero and the first conditional