If I were you, I would be very careful; there are poisonous snakes in this area.
If grass isn’t watered, it won't grow.
Ann wishes she had had more time so that she could take up a sport.
If only Timothy used his common sense more often.
Alan wishes he had brought some warm clothes with him so that he wouldn’t feel so cold.
If only I wasn't tired all the time; maybe I should get more sleep
The catwoldn't have scratched Harry if he hadn’t tried to pull its tail.
Never follow a particular diet unless you discuss it with your doctor first.