I. express the same using passive constructions. (example: we praised the girl. – the girl was praised.) 1. we wasted a lot of time when we were looking for the right 2. people can do a lot to stop the destruction of 3. people mustn’t use nuclear 4. you ought to rewrite the text to make it look nicer.

1. A lot of time was wasted by us when the right house was being looked for.
2. A lot can be done by  people to stop the destruction of forests.
3. Nuclear weapons mustn’t be used by people.
4. The text ought to be rewritten (by you) to make it look nicer.