if I were you, I would call her right now
if I were the head of our school, I would not allow teachers give bad marks
if I were invited to make round-the-world tour, he would give it a try
if wr opened more national parks, we would save wild animals
if we cut down fewer forests, the air would be clean and fresh
if we did not pollute our rivers and lakes, they would be full of fish
if we were clever and careful, we would not live among litter and waste
if we planed more new forests, we would not save wild animals
it we took care of our planet, we would not have so many environmental problem
if I were rich, I would help the poor animals