'Sharp' seems odd in this context, but the nature of the context is not clear. In most cases where this confusion is raised, both prepositions are acceptable, but learners tend to choose 'of' where native speaker usually use 'for'.
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Silly Sally But which one would you pick from the two - "vital source for sharp function" or "vital attribute to help sharp function"? There must be one somewhat better than the other.That just cannot be answered with assurance without knowing what 'sharp function' is supposed to mean and what the context is. This is an example of why it is often so difficul
Silly SallyPlease do not mind the choice of words. It was randomly made for the sake of questioning the issueYou don't seem to have learned from our discussion on the other thread that that is precisely what is wrong with many students' posts! Random word choice in the hands of learners usually leads to more oddities and errors than what was initially being