Su historia era demasiado tonta para que alguien la creyera.

English Translation

His story was too ridiculous for anyone to believe.

why is this subjunctive?

I believe this is an example of expressing doubt/denial which is a common use of the subjunctive. Imagine the sentence as his story was so ridiculous that I don’t think anyone believes it.

I have a simpler explanation: para que always triggers the subjunctive. Consider the positive case: “Su historia era lo suficientemente verosímil para que todos la creyeran”.

Disclaimer: I’m not a native Spanish speaker.

1 Like