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sandra moreno

on 20 February 2011

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PERFECT TENSES Present Perfect Past perfect Time Expressions We use the Present Perfect to talk about actions that happened or began in the past (it doesn't matter exactly when) and are still relevant now. Experience Change over time Accomplishments Uncompleted actions you are expecting Multiple actions at different times They have been to London. She has changed her appearance and make-up. Men have walked on the Moon. Homer hasn't finished his beer yet! Bart and CAT students haven't had classes for two days! a For / Since Use FOR to talk about a period of time: FOR TWO HOURS/ FOR THREE DAYS/ FOR FIVE YEARS. Use SINCE to say the exact time when an action or situation began: SINCE 2005/SINCE 10 O'CLOCK/ SINCE LAST FRIDAY. Yet / Already How long...? Use HOW LONG to ask a question about the duration of an action or situation: HOW LONG HAS THE LIBRARY BEEN OPENED? The Past Perfect expresses the idea that something occurred before another action in the past. It can also show that something happened before a specific time in the past. M&M's had never been happier as when they discovered pot :) Present & Past Perfect continuous We use the Past Perfect Continuous to show that something started in the past and continued up until another time in the past. "For five minutes" and "for two weeks" are both durations which can be used with the Past Perfect Continuous. Notice that this is related to the Present Perfect Continuous; however, the duration does not continue until now, it stops before something else in the past.
He has been riding his bike for 2 hours! He had been waiting in the lobby when she finally arrived Use YET for questions and negative answers. Use ALREADY to express a finished action.
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