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 What Is the Present Perfect Continuous Tense?

The present perfect progressive tense has two uses. It is used for: 
A continuous activity that began in the past and continues into the present.
A continuous activity that began in past, but has now finished (usually very recently).

The present perfect continuous tense is formed:

[subject] + "has been" or "have been" + [present participle]

I have been working since yesterday evening.    

She has been crying for two minutes.

Add "ing" to most verbs:

talk > talking

help > helping

If a verb ends in “e," remove the "e" and add "ing":

dine> dining

ride > riding

If the verb ends in “ie," change the "ie" to "y" and add "ing":

tie > tying

untie > untying

If the verb ends in a   consonant, double the consonant and add "ing":

stop > stopping

forget > forgetting

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