1 is fine; 2 is incorrect/ungrammatical.
3 and 4 are fine.
5 is fine; 6 is incorrect.
7 is fine; 8 is okay.
1. When he was playing the piano, his brother came in.
2. He playing the piano, his brother came in.
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3. While he was walking along the river, he was listening to music.
4. Walking along the river, he was listening to music.
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5. When he was driving a car, a person fell on to the street.
6. He driving a car, a person fell onto the street.
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7. When he was riding a bike, he saw Jack.
8. Riding a bike, he saw Jack.
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Are the four pairs all grammatical and interchangable?
1 answer
1 answer