To be appreciative is to be thankful or grateful, and to have an understanding of something's value. When we buy a jug of milk from the store we might not appreciate the work involved in raising dairy cows and milking them twice a day, but the child of a dairy farmer who sees his parents in the barn at 5 am milking the cows is more likely to appreciate having milk at breakfast.
Children absorb what they are exposed to, so when they see adults around them expressing gratitude to friends and strangers, they will learn to act the same way themselves. Living your own life with gratitude is the best way to teach your children to be appreciative. Also, keep in mind that expectations of gratitude and appreciativeness in children must be modified according to your child's developmental stage. Children under the age of 7 have a less-developed understanding of other people's feelings, but older children will be more able to understand and express gratitude.
If we think we're entitled to something, we're unlikely to appreciate receiving it. How grateful do you feel when you see clean water come out of the tap? It's an everyday thing for people in developed countries, and one which we see as a basic human right. Yet many, many people in the world would feel an overwhelming sense of amazement and gratitude to have a tap with clean water right inside their house. When we can understand feelings of entitlement as a barrier to gratitude we have taken a good first step to increasing our own appreciation in life and passing that on to our children.
Being appreciative and thankful in life are not just pleasant social graces, but can dramatically increase your enjoyment and feelings of connectedness to the world around you. By showing children what it means to appreciate things, other people and the wonder of hot running water, both you and your children will benefit for years to come.