He (work) in the laboratory for three hours when he stopped for a break. Alex (read) a book all night and was very sleepy the next morning.
They were exhausted because they (play) chess all day.
Before Fleming invented penicillin, he (experiment) with bacteria for a long time.
I (decide) that I was going to study Chemistry before I finished secondary school.
Alexander (already/learn) to read and write before he started school.
He was upset because he (miss) the last train.
He (reach) his house by the time it started to rain.
Past Perfect/Past Perfect Continuous
Had been working
Had been reading
Had been playing
Had been experimenting
Had decided
Had already learnt
Had missed
Had reached
had been working
had been reading
had been playing
had been experimenting
had decided
had already learnt
had missed
had reached