Посмотри вверх: на синем небе плывут облака.

the sky

Breakdown of Посмотри вверх: на синем небе плывут облака.

• облако: the cloud
• плыть: to float
• синий: blue

Questions & Answers about Посмотри вверх: на синем небе плывут облака.

Why is посмотри used here, and what form is it?

Посмотри is the imperative (command/request) form of посмотреть (perfective: “to take a look”).

• It’s addressed to one person informally (ты).
• If you were speaking politely or to more than one person, you’d use посмотрите.

What’s the difference between посмотри and смотри in a sentence like this?

Both can mean “look,” but the nuance differs:

• посмотри (perfective) = “take a look (once), glance,” often a one-time action.
• смотри (imperfective) = “look/watch,” can imply an ongoing act or also serve as “be careful/see to it” depending on context.
  In this sentence, посмотри fits well because it’s a prompt to direct your attention.

Why is вверх used without a preposition? What part of speech is it?

Вверх is an adverb of direction meaning “up(wards).” Many Russian direction words don’t need a preposition:

• вверх (up), вниз (down), вперёд (forward), назад (back).
  So Посмотри вверх is literally “Look up.”

What’s the role of the colon (:) in Посмотри вверх: ...?