UNIT 3

UNIT 3: IT'S A MYSTERY

WHO WAS THE MAN IN THE IRON MASK?

THE ORIGINS OF O.K

MYSTERIES

1. The mystery of the Mary Celeste

https://www.history.com/news/what-happened-to-the-mary-celeste

GRAMMAR

PRESENT PERFECT

1. Watch the videos about  the present perfect:

ONLINE PRACTICE: PRESENT PERFECT

Practice exercises about how to make the present perfect:

PRESENT PERFECT SIMPLE / PAST SIMPLE

ONLINE PRACTICE: PRESENT PERFECT OR PAST SIMPLE

COMMON MISTAKES: PRESENT PERFECT OR PAST SIMPLE?

PAST PERFECT TENSE

VIDEO EXPLANATION: PRESENT PERFECT AND PAST PERFECT (WHEN TO USE THEM)