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.