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Put the verbs in brackets into the correct form of the Past Perfect Continuous.
1) Sean (paint) the walls all day before he finished them.
2) I (study) in Oxford for 2 years when I met my husband.
3) Simona (work)as a nurse for thirty years when she retired.
4) My sister (look) for a job for three months when she found one.
5) We (wait) for Stan for half an hour when he turned up.
6) They (play) for an hour when it started to rain.
7) I (work) since morning.