ENGLISH SESSION #3: GRAMMAR PRESENT PERFECT (HOW LONG, SINCE, FOR)

 1. WATCH THIS VERY SIMPLE VIDEO TO REMEMBER THE STRUCTURE OF THE PRESENT PERFECT: 

                I/ YOU/ HE...    +    HAVE / HAS    +    PAST PARTICIPLE   

2. NOW WATCH THIS SECOND VIDEO TO UNDERSTAND THE DIFFERENCE BETWEEN 

SINCE AND FOR.