Questions & Answers about Я люблю покой, когда пью кофе утром.
Why is покой used for peace here instead of мир?
Мир means peace in a global or political sense (the opposite of war), or the world itself. Покой means peace in the sense of quiet, rest, or tranquility. Since the speaker wants a quiet, relaxing atmosphere with their coffee, покой is the right word.
Why does the second part of the sentence say just когда пью instead of когда я пью?
In Russian, if the subject is already clear from the first half of the sentence (Я люблю), you can drop the pronoun to avoid repetition and sound more natural. The verb ending in пью also makes it completely obvious that 'I' am the one doing the action.
Why is утром in the instrumental case?
Words for parts of the day (morning, day, evening, night) are put into the instrumental case to mean 'in the' or 'during the' time period. So the nominative noun утро (morning) becomes утром (in the morning).
Is пью imperfective or perfective, and why is that aspect used here?
It is imperfective. The sentence describes a habitual, general state—something you do repeatedly whenever you drink coffee in the morning. Imperfective verbs are always used to describe regular, repeated habits.
How does the verb (to drink) conjugate to get ?