Будь ласка, сядь біля вікна.

Будь ласка is the standard Ukrainian way to say please.

Literally, it comes from:

• будь = be (imperative of бути, to be)
• ласка = kindness, favor, grace

So the literal idea is something like be so kind. In modern Ukrainian, though, learners should treat будь ласка as a fixed polite expression meaning please.

It can also mean you're welcome in other contexts, but in this sentence it clearly means please.

Сядь is the imperative singular form, meaning sit down! or have a seat! when speaking to one person informally.

It comes from the verb сісти, which means to sit down or to take a seat.

So the forms are:

• сісти = to sit down
• сядь = sit down! (to one person, informal)
• сядьте = sit down! (formal or plural)

The dictionary form is not used here because this is a command/request, so Ukrainian needs the imperative form.

This is a very common question because both can translate as sit down.

The basic difference is aspect:

• сісти → сядь = perfective
  • focuses on the result: take a seat
• сідати → сідай = imperfective
  • focuses more on the process or action itself

In many everyday situations, both can be used, but the nuance is slightly different:

• Сядь = sit down / take a seat
• Сідай = go ahead and sit down

Often сідай can sound a bit softer or more inviting, while сядь can sound a little more direct. Adding будь ласка makes сядь polite.

Ukrainian often omits subject pronouns when they are already clear from the verb form.

Here, сядь already tells you that the speaker is talking to one person informally:

• implied subject = ти = you

So Ukrainian does not need to say ти unless the speaker wants extra emphasis.

This is different from English, where you is usually stated or understood but not built into the verb form in the same way.

You would use сядьте instead of сядь:

• Будь ласка, сядьте біля вікна.

This can mean:

• speaking politely to one person
• speaking to several people

So:

• сядь = informal singular
• сядьте = formal singular or plural

That is a very important distinction in Ukrainian.

Because the preposition біля requires the genitive case.

The noun вікно means window in the dictionary form, but after біля it must change form:

• вікно = window
• біля вікна = near/by the window

So the pattern is:

• біля + genitive

This is one of the most important things to learn in Ukrainian: prepositions often control a specific case.

Вікна is the genitive singular form of вікно.

Here is the basic pattern:

• nominative: вікно
• genitive: вікна

Since вікно is a neuter noun ending in -о, its genitive singular often changes to -а.

So:

• вікно → вікна

In this sentence, it is genitive because of біля.

Біля means by, near, or next to, depending on context.

In this sentence, біля вікна means by the window or near the window.

It is very similar to коло, which also means near/by:

• біля вікна
• коло вікна

Both are common and natural.

Sometimes there can be small stylistic differences depending on region or speaker preference, but for most learners, they are close in meaning and often interchangeable.

Because будь ласка is being used as a polite parenthetical expression, similar to please at the start of an English sentence.

So Ukrainian usually separates it with a comma:

• Будь ласка, сядь біля вікна.

You may also see:

• Сядь, будь ласка, біля вікна.

In both cases, commas are used because будь ласка is inserted as a politeness marker rather than being part of the core grammar of the sentence.

Yes. Ukrainian word order is fairly flexible.

The most neutral version here is:

• Будь ласка, сядь біля вікна.

But you could also say:

• Сядь, будь ласка, біля вікна.
• Біля вікна сядь, будь ласка.

These all mean roughly the same thing, but the emphasis changes:

• Будь ласка, сядь біля вікна. = neutral polite request
• Сядь, будь ласка, біля вікна. = also very natural; the command comes first
• Біля вікна сядь, будь ласка. = emphasizes by the window

So the original sentence is natural and neutral, but other orders are possible.

By itself, сядь can sound like a straightforward command, depending on tone and context. But with будь ласка, it becomes a polite request:

• Будь ласка, сядь біля вікна.

So this sentence is not rude in normal situations if you are talking informally to one person.

Still, tone matters a lot. In very polite situations, Ukrainian speakers might prefer:

• Будь ласка, сядьте біля вікна.
• Сідайте, будь ласка.

So the sentence is polite, but it is polite in an informal singular way.