How do you know when to use whom and when to use who?

In the great gatsby, daisy is described as

8. "caged bird" right now, i feel like a bird caged without a key everyone comes to stare at me with so much joy and reverie they don't know how i feel inside through my smile, i cry they don't know what they're doing to me keeping me from flying that's why i say i know why the caged bird sings only joy comes from song she's so rare and beautiful to others why not just set her free? so she can fly, fly, fly spreading her wings and her song let her fly, fly fly for the whole world to see she's like caged bird fly, fly ooh just let her fly just let her fly just let her fly spread the wings spread the beauty what is the allusion found in the poem? question 8 options: a) alicia keys b) i know why the caged bird sings c) spreading her wings and her song d) fly, fly, fly

These two sentences have one difference: one has a comma. think about what each sentence means. 1. let's eat, grandma. 2. let's eat grandma. what does the first sentence mean? what does the second sentence mean?