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have been prolonging

  • present perfect progressive
    of prolong.
    prolong
    verb (used with object)
    to lengthen out in time; extend the duration of; cause to continue longer.

Example Sentences

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They have all been assisting at the marriage of a niece of yours, I hear, and the Heavenly Twins have been prolonging the festivities on their own account.

From The Heavenly Twins by Madame Sarah Grand

Or he may, merely, have been prolonging an experience which he found agreeable.

From Mary Wollaston by Henry Kitchell Webster