Formula/Rule of Present Perfect Continuous Tense: (+) S + have/has + been + V-ing (-) S + have/has + not + been + V-ing (?) Have/has + S + been… [Continue Reading]
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Formula/Rule of Present Perfect Continuous Tense: (+) S + have/has + been + V-ing (-) S + have/has + not + been + V-ing (?) Have/has + S + been… [Continue Reading]