My recollection of my childhood french lessons is that when "suis" precedes a word that starts with a vowel, we pronounce the second "s" in "suis". But the duolingo french speakers don't do that. Was I taught wrong? Or is there a more complicated rule about this? Merci, Jeannette
No, the liaison - swee zoohn - should be made.
Unless I am very much mistaken, Duolingo uses a database library of words recorded by native speakers. These words are then turned into sentences using TTS - text to speech - technology so often the necessary liaisons are missed.