Grammar
Tense: Past perfect ou Pluperfect continuous – Form

She (to study) for hours when her friends called to invite her to the party.
I was exhausted because I (to work) on the project all night long.
They (to live) in that house for over a decade before they decided to move.
He was so tired because he (to run) a marathon for several hours.
He (to try) to fix the car all morning, but it still wouldn't start

I (to garden) in the backyard for weeks.
He  (to fish) for hours when he decided to pack up and leave.
She  (to practise) the piano for weeks before her performance.
He (to jog) regularly before he started to get in shape.
They (to renovate) the house for months when they ran out of money.