Practically every part of the banana tree is used by man.
I think this sentence is correct but my grammar book say there should be each instead of every. I know we can't use every as a pronoun but in above sentence every part used as a single unit. Correct me if I am wrong.
True. But then, if we want to talk about the banana tree's part individually (though all), we use each and not every.
BBC clarifies it-
We tend to use each if we are thinking about members of a group individually, and every if we are thinking of them in total.
Compare the following:
We gave each child who came to the party a present. We handed them out one by one.
We gave every child who came to the party a present We gave them all a present.
Found the exact phrase from the book Hawaiian Heritage Plants where it says each part is usable one or the other way.
An important point for use of every:
If I say 'every boy and girl' then it means every boy and every girl but when I say 'every boy and girls,' it is not to say every girl, but the 'every' is just particular with the boy. Also 'every girls' is incorrect.That's a nice thing to learn.
