[ Past Perfect Simple & Past Perfect Continuous ]
We use had been + the -ing of the main verb to form the past perfect continuous.
A. TRUE
B. FALSE

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Perfect Verb TensesSubordination ConjunctionsCompound SentencesTransitional Phrases and Conjunctionslike/do not likeVerb TensesAdverb of MannerGrammar and Sentence StructureInversions and SubjunctiveAbilityOther quiz:
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A. collapsed
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They were watching television when suddenly someone ______ at the door.
A. knocks
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A. so
B. because