Find and correct the mistake in each sentence.
1. You can save the electricity by turn off the light when not using them
2. He will clean his house at 9 am tomorrow
3. My sister will be buying a house in the city centre next year
4. Thew will build a 5 stars hotel on this street
5. A solution for the environment problem will soon be finding by scientists.
1.turn off=>turning off
2.will clean=>will be cleaning
3.will be buying=>will buy
4.starts=>star
5.finding=>found