Language has been changing much faster since people started using the Internet. - an activity that started in the past and continues until now, I mean, people have stopped using strict rules for punctuation. - an action that was completed at an indefinite time in the past, In about 50 years, most dialects of English will have died out. - an action that will be completed before a definite point in time in the future, People had been taking photos of themselves before 2013, but they didn't have a single word for it. - an activity that continued up to a definite point in time in the past, The word "wireless" had had a completely different meaning: it used to mean "radio". - a state that existed before a specific point in time in the past,

Perfect Aspect

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