Correct: SINCE THREE O'CLOCK, FOR AN HOUR , FOR AGES, FOR A LONG TIME, SINCE WE ARRIVED HERE, FOR A COUPLE OF DAYS, FOR MANY YEARS, SINCE I LEFT SCHOOL, SINCE LAST YEAR , SINCE MONDAY, Incorrect: FOR THREE O'CLOCK, SINCE AN HOUR, SINCE AGES, SINCE A LONG TIME, FOR WE ARRIVED HERE, SINCE A COUPLE OF DAYS, SINCE MANY YEARS, FOR I LEFT SCHOOL, FOR LAST YEAR, FOR MONDAY,

FOR VS SINCE

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