Model sharing for the preschoolers. At snack time, show them a package of crackers and say, "I brought these crackers to share with everyone at snack time." Pass out the crackers with a smile to show you enjoy sharing and being generous.
Stop and listen intently when a child has something to tell you. This will model patience and kindness -- both unselfish behaviors. If a child interrupts you or someone else, let him know that he should wait until the person is finished speaking before talking.
Voice your expectations so that preschoolers will know that you expect them to act in a generous manner toward others. Before activities tell the students that you expect them to share the supplies or toys and use kind words and actions when talking to others.
Set up centers around the room with different activities at each, such as a kitchen center, art center, building center and dramatic play center. Allow only a certain number of children at each center at a time. Set a timer and have children rotate centers in groups to allow each to have his or her fair share of time at each center. The preschoolers will practice sharing and generosity at each center, realizing as they move on to the next center they are not only allowing others to share in the center by moving on, but gaining a new opportunity by moving on to the next station due to another group's generosity.
Make plenty of popular toys available to the children for free play activities. If you note that many of the children like playing with blocks, make enough of them available so that several children can play together at the same time. This will promote generosity and sharing behaviors.
Praise the preschool students when you see them exhibiting generous behavior. Make specific comments so the children will know what they are doing correctly, such as "I like the way you made room at the table for your friend so she can use the crayons, too" or "Thank you for listening to your friend while she explained to you why she feels sad today. It's kind to listen to others."