Questions & Answers about Я люблю наблюдать небо ночью.
The current lesson is about the word for 'all' or 'whole'. How would I change this sentence to say 'I love observing the whole sky'?
You would use the neuter accusative form всё, changing it to всё небо. Because небо (sky) is a neuter noun and is the direct object of the sentence, both the pronoun and the noun use their neuter accusative forms.
What case is небо in this sentence?
It is in the accusative case because it is the direct object (the thing being observed). For neuter inanimate nouns like небо, the accusative form looks exactly the same as the nominative dictionary form.
Why do we use the imperfective verb наблюдать instead of a perfective verb here?
After verbs that express a general like or dislike for an action (such as любить, to love), you always use the imperfective infinitive. It describes the general habit or process of observing, rather than one specific completed event.
Why does the word for 'night' change to ночью?
ночью is the instrumental case form of the feminine noun ночь (night). In Russian, putting parts of the day into the instrumental case turns them into adverbs of time, so ночью means 'at night'.