Давай придём пораньше, чтобы спокойно сесть у окна.

Давай is a very common way to suggest doing something together, like let’s in English.

So:

• Давай придём пораньше = Let’s arrive earlier

Literally, давай comes from the verb давать (to give), but in modern conversational Russian it often works like a suggestion marker.

A few useful points:

• Давай is singular / informal, used with one person you address as ты
• Давайте is plural or polite, used with вы

So if you were speaking politely, you would say:

• Давайте придём пораньше...

Because the sentence is making a suggestion about a future action.

• придём = we will come / let’s come
• приходим = we come / are coming in a present-habitual sense

After Давай / Давайте, Russian often uses the 1st person plural future form to mean let’s do X:

• Давай пойдём = Let’s go
• Давай посмотрим = Let’s look / let’s watch
• Давай придём пораньше = Let’s arrive earlier

So even though it looks like a future tense form, in this structure it functions as a suggestion.

These are an aspect pair:

• прийти = perfective
• приходить = imperfective

In this sentence, придём comes from прийти, the perfective verb. Perfective is used because the speaker is thinking of the action as a complete event: arrive.

Why perfective makes sense here:

• The goal is to arrive earlier, as one completed action
• Then, after arriving, they can sit by the window

Compare:

• Давай придём пораньше = Let’s arrive early
• Мы обычно приходим пораньше = We usually come early

The imperfective приходить is more natural for repeated, habitual, or process-oriented meanings.

Both can mean earlier, but пораньше often sounds a bit more natural in everyday speech when talking about coming or doing something somewhat earlier than usual.

• раньше = earlier
• пораньше = a bit earlier / earlier than usual, often with a conversational tone

So:

• придём раньше = we’ll arrive earlier
• придём пораньше = let’s arrive a little earlier / reasonably early

The prefix по- often softens the idea and can make it sound less absolute or more practical.

Here чтобы means so that or in order to.

It introduces the purpose of the first action:

• Давай придём пораньше = Let’s arrive earlier
• чтобы спокойно сесть у окна = so that we can sit by the window calmly / without rushing

So the structure is:

• action + чтобы + purpose

Examples:

• Я пришёл рано, чтобы занять место. = I came early to get a seat.
• Мы поедем утром, чтобы не попасть в пробку. = We’ll leave in the morning so as not to get stuck in traffic.

Because сесть means to sit down, while сидеть means to be sitting.

Here the idea is: arrive earlier in order to get seated by the window.

• сесть = to sit down, take a seat
• сидеть = to sit, be seated

So:

• чтобы спокойно сесть у окна = so that we can sit down by the window calmly

If you used сидеть, the meaning would shift toward the state of already being seated, not the act of taking the seat.

Спокойно is an adverb. In this sentence it means something like:

• calmly
• without stress
• without rushing
• at ease

So the sentence suggests arriving early in order to sit by the window without having to hurry or compete for a place.

In natural English, you might translate it less literally as:

• so we can get a window seat without rushing
• so we can sit by the window comfortably

So спокойно is not necessarily about physical calmness only; it often implies doing something in an unhurried, stress-free way.

У окна is the normal Russian way to say by the window.

• у + genitive often means by, near, at
• у окна = by the window

Other options are possible, but they are not as natural here:

• около окна = near the window
  This is understandable, but a bit more literal/spatial and less idiomatic for seating.
• к окну = toward the window / to the window
  This expresses direction, not location, so it would not fit after сесть in this meaning.

When talking about seats in a café, restaurant, train, etc., у окна is the standard phrase:

• столик у окна = a table by the window
• место у окна = a seat by the window

Because у requires the genitive case.

The noun окно changes like this:

• nominative: окно
• genitive: окна

So:

• у окна = by the window

This is a very common pattern in Russian:

• у дома = by the house
• у двери = by the door
• у метро = by the metro station

So the form окна is simply the genitive singular of окно.

Yes. Russian word order is flexible, although the original version sounds natural and neutral:

• Давай придём пораньше, чтобы спокойно сесть у окна.

You could also hear:

• Давай пораньше придём, чтобы спокойно сесть у окна.
• Давай придём пораньше, чтобы у окна спокойно сесть.

But the original is probably the most natural for everyday speech.

Why this order works well:

• придём пораньше keeps the main idea together
• спокойно сесть у окна flows naturally, with the adverb modifying the whole action

So yes, other orders are possible, but the given one is a good default.

It is informal, mainly because of Давай.

You would say this to:

• a friend
• a family member
• a partner
• someone you address as ты

For a more polite or plural version, use Давайте:

• Давайте придём пораньше, чтобы спокойно сесть у окна.

Everything else in the sentence is neutral and natural; the informality mainly comes from the opening word.