If Jon eats two eggs he will be happy
If Jon ate two eggs he would be happy
If Jon had eaten two eggs he would have been happy
If you come I will see you
If you came I would see you
If you had come I would have seen you
If It does not rain so much there will not be all that greenery
If it did not rain so much there would not be all that greenery
If it had not rained so much there would not have been all that greenery
If you work hard you will be tired
If you worked hard you would be tired
If you had worked hard you would have been tired