Present Perfect Simple Vs Present Perfect Progressive

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Present Perfect Simple Vs. Present Perfect Progressive:

Present Perfect Simple Vs. Present Perfect Progressive By Mauricio Martínez

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Present Perfect Simple is a tense that denotates that certain action has ocurred in the past ( no matter when ) or it may continue up to the present . I have worked in many places before working for Cybor Inc. In this situation the action of working finished before working in Cybirg Inc. No matter when . The scientists have discovered a cure for stomach cancer No matter when , it is more important what they discovered YOU CAN USE ONLY SIMPLE PAST IF YOU HAVE A SPECIFIC COMPLEMENT OF TIME The scientists have discovered a cure for stomach cancer last week

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