Learn Hardcore Japanese: uketorinin ga hiruma ha ie ni inai node, saihaitatu wo onegaisimasita. - Because the recipient is not at home during the day, I asked for redelivery.

受取人うけとりにん　が　昼間ひるま　は　家いえ　に　いない　ので、　再配達さいはいたつ　を　お願ねがいしました。uketorinin ga hiruma wa ie ni inai node, saihaitatsu o onegaishimashita.

Because the recipient is not at home during the day, I asked for redelivery.

Breakdown of uketorinin ga hiruma wa ie ni inai node, saihaitatsu o onegaishimashita.

はwa

topic particle

をo

direct object particle

Questions & Answers about uketorinin ga hiruma wa ie ni inai node, saihaitatsu o onegaishimashita.

Why is 受取人 marked with が?

受取人 means recipient or the person receiving the package.

The particle が marks it as the subject of the clause 受取人が昼間は家にいない.

So this part means: the recipient is not at home during the day

Here, が is just identifying who is the one not at home.

Why is there a は after 昼間?

昼間は means as for the daytime or during the day with a slight contrastive feel.

The sentence is not just saying at daytime, but something closer to: during the day, at least, the recipient is not at home

That often implies a contrast such as:

maybe they are home at night
but during the day they are not home

If it were just 昼間に, it would sound more like a simple time marker. 昼間は highlights that time period as the relevant one.

Why is it 家にいない and not 家でいない?

With the verb いる (to be / to exist for animate beings), Japanese normally uses に to mark the location.

So:

家にいる = to be at home
家にいない = not to be at home

で is usually used for the place where an action happens, but いる is not treated as that kind of action here. It is about existence/location, so に is the natural particle.