Verb conjugation of "contribuir" in Spanish

I ordered a cab at four o'clock in the morning which took me to the Central Bus Station. I was much to early because the bus would go just at seven o'clock. Anyway I was sitting there and listening to music.
Dinner was a little strange. I was sitting as a guest at the dinner table but somehow I felt very uncomfortable. I felt that everything was staged for me. I sensed that this family was not used to having guests.
On the way back I visited a private beach resort. I just wanted to see whether I could get in and it was not a problem at all. The resort belonged to some club on the main land near Cancun.