Have a tea party and let children taste different kinds of tea also serve muffin and teach children to say please pass the muffin and Thank you for the tea. You can let children serve others and teach them to ask in polite manners (would you like more tea sir or miss.) A tea party make learning manners so much fun for children.
Have the children make a snack and then pass it along to someone else in the class or take them to another class and share it. I have done it where each child scoops some different items into a cup (trail mix items) and then takes it to another child. The teacher should direct how the children give it away, so as not to miss anyone.
The children love how it feels to share. Afterwards talk about what they felt and other times they have shared.