Certainly! Here are nine sentences suitable for a third-grade English level:
1、The cat is sleeping on the mat.
2、I like to play with my friends at recess.
3、My mom bakes delicious cookies for me.
4、The sun is shining in the bright blue sky.
5、We read an interesting story in class today.
6、I have a red bicycle with shiny wheels.
7、The flowers in the garden smell so sweet.
8、My teacher helps me learn new things every day.
9、I can jump very high on the trampoline.
These sentences are designed to be simple and easily understood by third-grade students.