you (open) an umbrella indoors, it (bring) bad luck. 2. If you 3. If we (have) an itchy nose, you (have) an argument with someone soon. (destroy) the ozone layer, nothing (save) us from the UV rays 4. If people really_(not care) about the environment, they (not try) to save it. 5. If Paul (think) more about the planet, he wouldn't waste so much water. 6. If we consumed less, we (produce) less waste material.