The Condition Referring to the Future

If the condition refers to the future, the Suppositional Mood (the mood auxiliary
«should» for all persons + the Infinitive) is used in the subordinate clause, in the principal clause either the Indicative, the Imperative or the Conditional) Mood is used.
I want to know it. e.g. If you should see Ann, let me know.
could you ask her to call me?