Estelle0 There is an error in the audio when sentence is played slowly. There is definitely a "t" heard in 'esta '. I went back when I saw the correct word was "esa" and played the fast sentence in which "esa" was clear. This is not the first time this sort of thing has happened. There is often an error in the spoken word is in the group spoken slowly--Have demo'd this to another person in my home, and they hear those words as I do. Don't know how to make that type of correction when I post a response in these discussions. Has happened several times, so I just go on having accepted the correction to my answer, knowing it will be repeated again so I use the "right" answer tho that's not what we always hear.