Remember, driving forces are different in each type of chemical reaction. In single replacement reactions, the driving force is a precipitate. In an acid-base reaction, it is the formation of water. In a double replacement reaction, the driving force can be either a precipitate, the formation of water, or even a gas. If you are still having trouble, these links can help.
Link 1: http://schools.birdville.k12.tx.us/cms/lib2/TX01000797/Centricity/Domain/912/ChemLessons/Lessons/Acids%20and%20Bases/Driving%20a%20Reaction.htm
Video 1: https://www.youtube.com/watch?v=D4jhofCgNFY
Video 2: https://www.youtube.com/watch?v=AiMwUnuyDDc
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