We watched a video that helped explain living vs. non-living and it even talked about once-living. Ask your child and see if they can tell you what each one means. We were also able to read a couple books about living and non-living and complete some sorts.
One day last week we decided to make a living and non-living collage to show what we knew. Together in groups of 9, the kids worked together to look through magazines and find pictures of living things or non-living things, depending on what group they were in. Then we were able to share what we found. Here is a picture of their hard work. They did awesome.