gramática inglesa AUDIO MP3, Present perfect continuous
http://www.inglesparaespanoles.com/wp-content/uploads/AUDIO-Lesson-40-Present-Perfect-Continuous-1.mp3 Lesson 40 www.inglesparaespanoles.com 1 Free English Grammar * Gramática Inglesa Gratis Present Perfect Continuous – I have been working = (He estado trabajando)