Раскройте скобки: i (know) that we will have homes that are more environmentally friendly. if this (happen) we will use alternative sources of energy. (every,some) way wil be easier, (as,so,while) lights will go on and windows will open when we ask them to.

I know that we will have homes that are more environmentally friendly. If this happens we will use alternative sources of energy. Every way will will be easier, as lights will go on and windows will open when we ask them to.