Present Perfect: A completed action that has an effect on the present., A past action that continues up to the present., A past action where the specific time is not stated, and we want to emphasize the action., have/has + verb in past participle, The world´s population _________ (double) since 1960., Prices _________ (rise), so people are spending less money.., Present Perfect Continuous: An activity that started in the past and may or may not be in progress in the present., A recent activity when we want to emphasize the process or durantion of the activity., It is never used with stative verbs., The Price of oil ________ (fall) slowly over the past few years., People ____________ (use) more oil in the past 20 years., Have/has + been + verb with ing,

Present Perfect & Present Perfect Continuous

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