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1. My mother (to cook) when I (to come back) from the University yesterday.
2. We already (to do) our work.
3. All people (to go away) by six o’clock yesterday.
4. We (to finish) our test by the end of last lesson.

1. My mother was cooking when I cfame back from the University yesterday. 2. We have already done our work. 3. All people had gone away by six o’clock yesterday. 4. We had finished our test by the end of last lesson.