Please review both the sentences and please explain.
If you have any doubt or query.
If you have any doubts or queries.
Please review both the sentences and please explain. If you have any doubt or query . The speaker thinks you are likely to have just one.
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Please review both the sentences and please explain.
If you have any doubt or query. The speaker thinks you are likely to have just one.
If you have any doubts or queries. He thinks you are likely to have more than one.
These are just subordinate clauses.
Full sentences would be
eg If you have any doubt or query, please call me.