NATURAL SCIENCE UNIT 5: SESSION # 3
HOW DOES SOUND TRAVEL?
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.
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