When should you use "who" and "whom" in a sentence?

In my opinion you can use either in a sentence.

Explanation:

I would use whom because it is more formal.

i don't see any questions on your profile, currently, but i'd be happy to try and with any problems that you have, so long as i understand the problem myself.

the sun warms our planet, and with the moon, creates the tides. the moon orbits the earth and in turn, the earth orbits the sun. because they appear to be the same size in the sky, the sun, earth and moon work together to create eclipses. when the moon is directly in between the earth and sun