Complete the sentences by transforming the verbs in brackets in the Past Perfect Continuous. Use full forms of the verbs.

Write 3–5 words in each gap.

How long [ ] (your grandfather / to sit) on the bench in the park before he returned home?

Joe was on his hands and knees on the ground. He [ ] (to look) for his glasses.

It was Christmas Eve and it [ ] (to snow) for twelve hours.

[ ] (you / to work) at a school before you found a new job?