1. Boiling an egg is not difficult

-> It is not difficult to boil an egg.

2. The ancient Egyptians built the pyramids

-> The pyramids were built by the ancient Egyptians.

3. Cairo is hotter than Lon don

-> Lon don isn't as hot as Cairo.

4. It's two years since I was just in Ha noi

-> I have not been in Ha Noi for two years.

5. She is overweight because she eats too much meat

-> If she didn't eat too much meat, she wouldn't be overweight.

6. '' I have visited this beauty spot many times '' said my father

-> My father told me he had visited that beauty spot many times.

7. People say that he is a famous singer

-> It is said that he is a famous singer.