Ex. Use the Past Continuous or the Past Perfect Continuous instead of the Infinitives in brackets.
1. She had a sore throat because she (to sing) since morning.
2. He (to read) his evening paper as usual when a friend of his called him on the telephone.
3. He (to read) before the fire for half an hour when the telephone rang.
4. When we went to see them last night they (to play) chess; they said they (to play) since 6 o’clock.
5. The boys (to play ) football and didn’t hear their mother calling them from the window.
6. The boys were tired because they (to play) football for an hour.
7. He (to look) at the fire and (to think) or something.
8. He (to look) 3 or 5 minutes at the fire and then turned his face to me; it was sad.
9. At last I found the book which I (to look far) all day.
10. He asked me what I (to look for).
11. When I entered the room sir George (to talk) in a loud voice.
12. They told me sir George just (to talk) about me.
13. She put aside the book she (to read) since morning and rose from her seat.
14. We (to work) in silence for some time when john spoke.
15. Robert was awfully tired as he (to work ) all afternoon.

1.had been singing2.was reading3.had been reading4.were playing...had been playing5.were playing6.had been playing7.was looking..thinking of8.was looking9.I had been looking for10.I was looking for11.was talking12.had jusi been talking13.had been reading14.had been working15.was working