I’m a little obsessive about proper usage, but there are plenty of holes in my knowledge of writing style. Thus, when I saw “all our funds,” it drove me to the internet to see if that should read “all of our funds.” My first observation: this seems to be a question mainly for English language learners. There don’t appear to be many established grammar or style gurus writing online about this topic.

Use “all of” only with pronouns, says Grammar Monster

Grammar Monster says to use “all” before any noun except a pronoun. For example, “all of us,” but “all the cheese.” In a sidebar, it says that “all of” is an indefinite pronoun, but “all” is an “indefinite adjective.” How’s that for a bit of grammar trivia?

Garner’s agrees

Although I follow Grammar Monster on Twitter, the site isn’t one of my regular go-to resources. So, I delved into my trusty Garner’s Modern American Usage. Garner says that “all” is more formal than “all of.” He says one should use “all of” only before a pronoun—agreeing with Grammar Monster—or when a possessive noun follows, as in “Beyond all of Jones’ ego-stroking maneuvers.”

That’s all for now on my latest research.