If your child lies alot it can be counter productive to ask him "Did you do 'thus and so'?" and then when he says "no" you punish him for lying and he will never admit to the truth. Its often more helpful to just say "I saw you do (whatever it was), so your consequence is..." or "I heard you did..." and then give a consequence or warning. If you really don't know if the child did something or not it may be helpful to ask them, but kids who lie constantly when you (or another witness) KNOW they did it, its usually easier to just not give them even an opportunity for lying and just move to the consequence for the behavior.
General Parenting Interventions and Behavior Tips
General Behavior- Tips, strategies, picking battles, rewards, consequences
Specific Behaviors- Whining, Cursing, Lying, etc
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