Present Perfect usage : use for something that started in the past and continues in the present, use when we are talking about our experience up to the present, use for something that happened in the past but is important in the present, use to look back from the present:, normally use the ..... perfect continuous to emphasise that something is still continuing in the present, Past Perfect usage : use to look back from a time in the past, use for something that started in the past and continued up to a later time in the past, use when we are reporting our experience up to a point in the past, use for something that happened in the past and is important at a later time in the past, use the ... perfect continuous to show that something started in the past and continued up to a time in the past or was important at that time in the past, Future Perfect usage : use the .... perfect to look back from a time in the future to a time before that., use the .... perfect continuous to focus on the length of time the action takes., Present Perfect examples : She’s been waiting for hours, I've played the guitar ever since I was a teenager., Teresa isn't at home. I think she has gone shopping., Past Perfect Examples: When George died, he and Anne had been married for nearly 50 years., My eighteenth birthday was the worst day I had ever had., I couldn't get into the house. I had lost my keys., Future Perfect examples : The guests are coming at 8 p.m. I'll have finished cooking by then., I won't have written all the reports by next week., Will you have gone to bed when I get back?,

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