1) eight o'clock a) for b) since 2) six years a) for b) since 3) three hours a) for b) since 4) March a) for b) since 5) twenty minutes a) for b) since 6) yesterday a) for b) since 7) 17th century a) for b) since 8) 2012 a) for b) since 9) a long time a) for b) since 10) 30 seconds a) for b) since 11) last week a) for b) since 12) a year a) for b) since 13) many years a) for b) since 14) half an hour ago a) for b) since 15) half an hour a) for b) since

Present Perfect Tense : for or since

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