French language Q&A Forum

In the last sentence, why is it "Bien que les années aient passé" instead of "Bien que les années soient passées" considering that passer is intransitive in this case? Thank you 

Salut! In the last sentence I had written “ensuite” instead of puis but this is marked incorrect. I thought they were interchangeable? Please can you tell me the difference? 

Hi,

I thought that "vieux" can be singular AND  plural but the quiz says it is only singular.