I'm attempting to help you identify why it's difficult for you to hear every word in a sentence. could be because the ed ending is being disappearing because it's connected to the next word,  could be because the auxiliary verb is being contracted down to a tiny little sound and all of these things can make it hard for you to notice verb tenses. I will also attempt to highlight some of those features of connected speech, the linking, the elision of words or sounds, the intrusive sounds if there are any and the schwa sounds as well,. okay, so let's get started with this sentence.