"has been" as a auxiliary verb
"One need to explain and emphasize the nature and extent of US military aid to Pakistan's military to highlight how critical this [B]has been[/B] to Pakistan's army. here has been makes what sense? is it mean k ye imdad pakistan ke leye kitne zarore reh chuke hai??
i am so confused pertaining to use of Has been. have been and had been as auxiliary verbs.
plz guide
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