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1. I (to write) an exercise now.
2. I (to do) my homework when my mother came.
3. He ( not to go) to the school yesterday.
4.He (not to sleep) now.
5. He (to by) a book yesterday.
6. What Nick (to do) tomorrow& Tom

1. I am writing an exercise now.2. I was doing my homework when my mother came.3. He didn't go to the school yesterday.4. He is not sleeping now.5. He bought a book yesterday.6. What will Nick do tomorrow?