Many times its easier for children to hit their friends when they need something; or even grab a toy. Since we are there caretakers, it is our responsibility to teach our children how to use their words. Also, by using different strategies that can support our children in daycare or preschool.
"Play games that encourage cooperation. Pretend games, such as playing house, help teach preschoolers to work cooperatively. Because these games emphasize role-playing, they also teach your preschooler to express his feelings with words. If he gets angry during the game, prompt him to talk about his feelings by asking, "You're the daddy in this house. What does a daddy say when he feels angry?" If he's had a good example to follow, he'll handle it just like his own daddy does: by saying he's angry and explaining why."
Read more at Babycenter