No puedo ir hoy. Lo que pasa es que el proyecto acaba de complicarse.

Questions & Answers about No puedo ir hoy. Lo que pasa es que el proyecto acaba de complicarse.

Why use lo que pasa es que here, and why does it take the indicative (acaba) instead of the subjunctive?
Lo que pasa es que (literally "what happens is that") is a common discourse marker used to introduce an excuse or explanation, just like saying "The thing is..." in English. It uses the indicative mood (acaba) because you are declaring a fact to justify why you can't go, rather than expressing doubt, desire, or an emotional reaction.
What does acaba de mean before complicarse?
The formula acabar de + infinitive means "to have just done something". Here, acaba de complicarse means "it just got complicated." It is a very common way to talk about an action that just happened in the immediate past, using a present tense conjugation.
Why is complicar used with the pronoun se (complicarse)?
The se is used here to show a change of state. While complicar means "to complicate" (meaning you complicate something else), complicarse is reflexive/pronominal and means "to get complicated" or "to become complicated" on its own.
Can I put the se from complicarse anywhere else in the sentence?
Yes! When you have a conjugated verb followed by an infinitive (like acaba de complicar), pronoun rules allow you to attach the pronoun to the end of the infinitive (as seen here: acaba de complicarse) or place it right before the conjugated verb (se acaba de complicar). Both options are perfectly natural and mean the exact same thing.

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