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"If you have any doubt", let me know." "If you have any doubts, let me know."

Both sound correct. Are there any subtle differences in meaning?

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1 Answer 1

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Doubt can be both a mass noun and a countable noun.

So one can be filled with doubt (mass noun), one can have a a number of doubts about something (count noun), and one can also have just a single doubt about the whole complex process (count noun).

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