2 if there weren't so many billboards in our city , people could enjoy the view
3 if there wasn't so much light in the city at night , we could see the start clearly
4 if we turned on the heater all the time , we would have to pay three ......
5 if the karaoke didn't make so much noise almost every night , the residents wouldn't complain to its owner
6 if she didn't work in a noisy office , she wouldn't have a headache after work every day