Can you try asking the following questions to your child;
Why do you wear a coat?
Why do you have to brush your teeth?
Why do you have to wash your hands?
Why does ice melt?
Why do you have to wear a seat belt?
Why do we use a knife and fork when eating?
Why do we need an umbrella when it rains?
Why do you have to wear a helmet when riding a bike?
Why do birds have wings?
Why do we have ears?
You could also read a story to your child and ask them questions about why something happened in the book.