**At three, start with one specific action and a reward soon afterward.** “Behave well for a while” asks him to track time, remember earlier behavior, and control his emotions—all skills he is still developing. A clearer explanation alone may not solve that mismatch.

You can teach earning and waiting in small steps:

- **Define what earns the reward beforehand.** “First we put the blocks in the basket, then we watch your show.” Help him get started. Avoid “if you’re good,” which leaves him guessing about what counts.
- **Reward the action promptly and name it.** “You put your blocks away! Now it’s time for the show.” Specific praise and immediate rewards help young children connect their actions to the outcome. [CDC guidance](https://www.cdc.gov/parenting-toddlers/responding-to-behavior/using-rewards.html)
- **Practice waiting separately, when he is calm.** Start with a few seconds during an ordinary activity: “Your turn after I finish mine.” Gradually lengthen the wait as he succeeds. Make the endpoint visible and predictable.
- **Teach a replacement for yelling.** Practice “Help, please,” or “I’m frustrated,” together. Notice and praise attempts, including when he needs prompting.

When he says, “I’ll behave,” you can answer with something he can actually do:

> “You want your show. First the blocks go in the basket. I’ll help.”

If he melts down, keep the explanation short:

> “You’re upset because you want it now. I’m here. We can put the blocks away when you’re ready.”

Keep the agreed boundary, keep everyone safe, and offer help calming down. Save teaching and discussion for afterward; tantrums are common at this age, and calm, consistent responses are more useful than arguing through them. [American Academy of Pediatrics guidance](https://www.healthychildren.org/english/family-life/family-dynamics/communication-discipline/pages/temper-tantrums.aspx)

**Once he completes the agreed task, honor the reward.** Avoid extending the requirement because he protested along the way. Otherwise, the finish line becomes unpredictable.

For now, replace “you’ve been a terror today, so no TV” with several small, clear opportunities to succeed. Over time, those experiences give him the foundation for earning rewards over longer periods.