"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?
"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?
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).