How do the Sun, Earth, and Moon depend on each other?

Answer 1

Without the sun the Earth would fall out of orbit. It would also receive no light if the sun wasn't there.
The tides of the Earth are controlled by the moon.

Answer 2

and without the earth, the moon would not be in an orbit around it :)
Tides are controlled both by moon and sun, spring tides around new and full moon are a little higher than neap tides halfway in between.

Answer 3

the earth needs light from the sun and the moon controls the tides of the Earth.

Answer 4

Thank you very much!