All is used with both countable and uncountable nouns.

• All people have to eat in order to live.
• All children are innocent.
• All citizens are equal.
• All cats are beautiful & All the cats in the shop are beautiful.

of can be used with all as:

• All the eggs = All of the eggs All his time = All of his time

• All my money = All of my mone All these cats = All of these cats

• All these = All of these All that news = All of that news

• All this = All of this All those books = All of those books

But of must be used with you, us, it, them

• All of them All them

• All of it All it

• All of you All you

• We are all staying here ( after auxilary)
• They all come to the party (before the verb)
• The students all finished their homework.
• The workers must all come early.

• All of their work was useless. = All their work Their all work
• The kid ate all of it. = The kid ate it all. all it
• She invited all of them = She invited them all. all them
• I need all of you = I need you all. all you
• She hates all of us. = She hates us all. all us

All sometimes means everything, the only thing

• All (=everything) he said is a lie.
• All (= The only thing) I need is a job.
• All she wants to do is help.