Share past perfect simple or past perfect continuous
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She was out of breath because (she / run) for the last ten minutes.
She was out of breath because she had been running for the last ten minutes.
(he / work) on the project for weeks before he presented it to his boss.
He had been working on the project for weeks before he presented it to his boss.
We were late because (the bus / not / come) on time.
We were late because the bus hadn't come on time.
By the time I got to the bakery, (they / sell) all the bread.
By the time I got to the bakery, they had sold all the bread.
