If artificial meat __ so expensive to produce, humans ____ stopped consuming real meat.
If artificial meat wasn't so expensive to produce, humans would have stopped consuming real meat.
If such a large potion of non-renewable resources ___ mined in the past, people____so desperately need to develop new energy sources.
If such a large potion of non-renewable resources hadn't been mined in the past, people wouldn't so desperately need to develop new energy sources.
If we ___ used so much electricity last month, our bill _____ so crazy.
If we hadn't used so much electricity last month, our bill wouldn't be so crazy.