Question

1. "What (to be) you doing now?" "I(to be) preparing for my credit test in Physics." 2. Yesterday from 2 till 6 o'clock we (to be) working at our scientific laboratory. 3. When I was at my sister's at 4 p. m. yesterday she (to be) learning Latin. 4. Tomorrow at 5 p. m. I (to be) preparing a lecture.
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Answer 1

1. "What are you doing now?" "I am preparing for my credit test in Physics."

2. Yesterday from 2 till 6 o'clock we were working at our scientific laboratory.

3. When I was at my sister's at 4 p. m. yesterday she was learning Latin.

4. Tomorrow at 5 p. m. I will be preparing a lecture.