3) past perfect & past perfect progressive


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Past Perfect Tense
source: RebeccaESL    2012-05-31 
quiz: http://www.engvid.com/past-perfect-te...

How to use the Past Perfect tense
source: MrSkypelessons  2014-4-16
http://skype-lessons.com/

Past Perfect Continuous
source: Holmwood's Online Learning    2012-11-09
exercises: https://www.holmwoods.eu 

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

PAST PERFECT CONTINUOUS
source: cursosdeinglesats    2012-05-24

Past perfect continuous tense
source: Jamal Shah    2012-08-08

Past Perfect Simple and Past Perfect Continuous
source: Englishbox online English lesson per webcam   2010-05-14http://englishbox.co.uk

Past Perfect & Past Perfect Continuous
source: TheoESL   2011-10-16

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