d) present perfect vs. present perfect progressive vs. simple past


Present perfect continuous 
source: Holmwood's Online Learning    2013-04-16
exercises: https://www.holmwoods.eu 

PRESENT PERFECT CONTINUOUS
source: cursosdeinglesats    2012-05-22

The Present Perfect Continuous Tense
source: learnamericanenglish    2008-06-02

Questions in the present perfect continuous tense
source: learnamericanenglish      2011-08-13 

Present Perfect Progressive Tense
source: TeacherPhilEnglish    2013-01-27

Present Perfect/ Present Perfect Progressive
source:  JenniferESL    2012-07-17
http://englishwithjennifer.wordpress....

Present Perfect Continuous vs Present Perfect
source: Anglo-Link   2011-08-28
https://anglo-link.com
Present Continuous / Present Perfect Continuous

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