Sarah has visited Central Africa many times - look back from now to a completed action at an indefinite time in the past, Frank has been collecting coins since he was a boy - look back from now at something that started in the past and is still continuing, Jack will have been just about everywhere by the time he's 60 - look back from a point in the future to a completed action, Anne had never owned a pet before she joined the Animal Defence League - look back from a point in the past to an earlier event,

Perfect Aspect

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