Verb conjugation of "garantir" in French

I bought the ticket very quickly and ran to the gate. A stewardess was waiting for me and waved. She shouted that I should hurry up. I ran as fast as I could and entered the gate leading to the plane.
The idea is to use the sourcing to get as much information as possible about learning abilities and disabilities in average. This way we can determine and forecast best practices for language learners based on some parameters.
To me this seems quite nice. I understand everything, write me, either in English, Spanish or German. I'll write again later - now I have to go to my wife, she's been waiting for me outside.