gramática inglesa AUDIO MP3, Past perfect continuous
http://www.inglesparaespanoles.com/wp-content/uploads/AUDIO-Lesson-41-Past-Perfect-Continuous-1.mp3 Lesson 41 www.inglesparaespanoles.com 1 Free English Grammar * Gramática Inglesa Gratis Past Perfect Continuous – I had been working = (Yo había estado trabajando)