For + duration (period of time): 20 minutes, three days, 6 months, 4 years, 2 centuries, a long time, two days, an hour, six hours, five years, ever, Since + specific point in time: 9am, Monday, January, 1997, 1500, I left school, the beginning of time, Tuesday afternoon, my childhood, this morning, May 1993,

Prepare 3 unit 14: Present Perfect Simple with for or since

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