Past perfect simple and Past perfect continuous | Baamboozle - Baamboozle

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He __________(study) at university for 4 years

had been studying

When she __________ (do) her homework, she played with her friends

had done

They couldn't open the door because they ______ (forget) the key

had forgotten

I __________ (work) for 12 hours

had been working

Which tense gives more importance to duration?

past perfect continuous

Which tense gives more importance to the completion of the action, before another action in the past?

past perfect simple

I ___________ (take) a shower before I left home

had taken

He ____ (study) for the exam, he failed.

hadn't studied