What’s the difference between all and all of? When should one use of following all to make all of, and when should one drop the of and just use all all by itself?
For example, in this sentence:
How come I can understand spoken American English better than British English in all its variants?
Is an of required after the all, making it all of its variants instead?
Dunno why but my instincts tell me that I shouldn’t put the of in right there. But I am unaware of source of my instinct.
