HAVE TO:

I don't believe you have to be better than everybody else. I believe you have to be better than you ever thought you could be.

Ken Venturi

To be successful you have to be selfish, or else you never achieve. And once you get to your highest level, then you have to be unselfish. Stay reachable. Stay in touch. Don't isolate.

Michael Jordan

The only thing we have to fear is fear itself.

Franklin D. Roosevelt

Clickable exercises here:
http://www.englishgrammarsecrets.com/musthaveto/exercise3.swf
http://www.englishgrammarsecrets.com/musthaveto/exercise4.swf

DON'T HAVE TO:

Obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it.

Michael Jordan

Take the first step in faith. You don't have to see the whole staircase, just take the first step.

Martin Luther King, Jr.

To be successful you have to be selfish, or else you never achieve. And once you get to your highest level, then you have to be unselfish. Stay reachable. Stay in touch. Don't isolate.

Michael Jordan

Clickable exercises here (have to, don't have to, has to, doesn't have to):
http://english-zone.com/verbs/haveto1.html

MUST

http://www.brainyquote.com/quotes/keywords/must.html

Clickable exercises:
http://www.englishgrammarsecrets.com/musthaveto/exercise2.swf

MUSTN'T

You're only given one little spark of madness. You mustn't lose it.

Robin Williams

One mustn't ask apple trees for oranges, France for sun, women for love, life for happiness.

Gustave Flaubert

Stupidity is also a gift of God, but one mustn't misuse it.

Pope John Paul II

Clickable exercises (must, mustn't):
http://www.englishexercises.org/makeagame/viewgame.asp?id=2786


Loads of exercises:
http://www.agendaweb.org/verbs/modals-must-have-to-exercises.html
http://www.agendaweb.org/verbs/modals-must-have-to-exercises-2.html