A כינוי הנסתר (hidden pronoun) sometimes comes with the letter נ with a diacritic dot - יפקדֶנוּ יפקדֶנָה. And sometimes, it comes without the letter נ, only the pronoun alone יפקדוֹ יִפְקְדָה or with the letter ה - יפקדהוּ.

And there is a rule in this: Any place where the absolute future comes – the pronoun comes with the letter נ. And in a place where the absolute future does not come, only the revealing of one’s will and desire, and moreover when a future tense verb comes with the prefix letter ו that reverses, and moreover in a place where the direct object pronoun is not intended to be precise – the letter ה or the letter ו will come alone.