IV.1-Solar panels will be installed on the roof of our house next week by them.

2-Will cracks be checked on the water pipes in two days by the plumber?

3-The films on types of future energy sources won't be showed next Friday by them.

4-The old thermal power plant will be destroyed at the end of this year by them.

5-Biogas will be used for cooking and heating at this time next month by us.

6-Fossil fuels won't burned for energy in the future by people.

7-Shall our electricity bills be reduced to 20% in 5 months by us?

8-Electricity will be provided this time next year by us.

9-The tax on petrol will be increased to 15% next September by them.

10-Ordinary 100-watt light bulbs with energy saving-ones shall be reduced by us.