Ain't is slang for "Isn't" . You won't find the word "Ain't" in our books, but WILL hear it in plenty of songs. Are you enjoying listening to English music? I always encourage students to spend some time listening to music "Karaoke" style - using subtitles, and why not sing along? for some fun practice. Films are always "difficult" - better to find an someone on social media, as it is usually one person talking to you. Much easier to follow than a film with all the sound effects, fast talk, slang etc... OK without any more to do, let's get started on Book 9! ALMOST through the method!