Hi, to make a constructed response on the moon phases you'll need many things. First off, it would help if you had a chart of the moon to help label the phases of the moon. Then you should explain how the different phases of the moon are seen from earth, and explain why the moon has different phases. Try adding in how the moon is always half-lit, how it orbits around the earth, and how since it does orbit around the earth, the changing perspective makes different amounts of the lit half of the moon visible from earth.
I hope this helps and doesn't confuse you more. I just tried to lay out a few questions you should answer and some details you should throw in. If you need more help feel free to message me! :)