1. It snowed heavily last Sunday.
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2. Ann dropped the plate.
The plate was dropped by Ann.
3.
4. Tommy has broken your favourite cup.
Your favourite cup has been broken by Tommy.
5. The earthquake of 2008 in China destroyed a lot of towns and villages of the country.
A lot of towns and villages of the county were destroyed by the earthquake of 2008 in China.
7. Lightning caused the fire.
The fire was caused by the lightning.
8. That incident happened long ago.
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9. I will give Tom something to eat.
Something to eat will be given to Tom by me.
10. Who brought the mail?
Who the mail was brought by?
11. Nobody is translating the article.
The article is being translated by nobody.
13. Our teacher always collects our papers at the end of the class.
Our papers are collected by our teacher at the end of the class.
14. Most people don't obey these rules.
These rules aren't obeyed by most of the people.
15. Your plan has succeeded at last.
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have, was, got up, played, used, was, watched, knew, read, had.