LEARN ENGLISH GRAMMAR - TENSES - PRESENT PERFECT CONTINUOUS / PAST PERFECT CONTINUOUS / FUTURE PERFECT CONTINUOUS
YOU TUBE LINK
https://youtube.com/watch?v=lR_VTbBUT20&feature=shares
DEFINITION
The perfect progressive tense (also called the perfect continuous tense) is used to say that an event or action is, was, or will be continually occurring (progressive) but that it is, was, or will be completed at a later time, or that it relates to a later time (perfect).
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