(1) It is hard to understand the use of "on" and "with."
(2) It is hard to understand the uses of "on" and "with."
Which is correct?
Both are OK, but (2) emphasizes more strongly that there is more than one use of "on" and more than one use of "with", and they are all hard to understand. CJ
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Both are OK, but (2) emphasizes more strongly that there is more than one use of "on" and more than one use of "with", and they are all hard to understand.
CJ