Question

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

Answer 1

Had been working

Had been reading

Had been playing

Had been experimenting

Had decided

Had already learnt

Had missed

Had reached

Answer 2

had been working

had been reading

had been playing

had been experimenting

had decided

had already learnt

had missed

had reached

Answer 3

Here are the sentences filled in with the appropriate forms of the verbs using Past Perfect and Past Perfect Continuous tenses:

1. He had been working in the laboratory for three hours when he stopped for a break.
2. Alex had been reading a book all night and was very sleepy the next morning.
3. They were exhausted because they had been playing chess all day.
4. Before Fleming invented penicillin, he had been experimenting with bacteria for a long time.
5. I had decided that I was going to study Chemistry before I finished secondary school.
6. Alexander had already learned to read and write before he started school.
7. He was upset because he had missed the last train.
8. He had reached his house by the time it started to rain.