Zašto si još u krevetu, i zašto se danas ne oblačiš za posao?

In Serbian, the subject pronoun is often omitted because the verb form already shows who the subject is.

• si = you are (2nd person singular of biti, to be)
• oblačiš = you get dressed / you are getting dressed

So ti is not necessary. You would add ti only for emphasis or contrast:

• Zašto si ti još u krevetu? = Why are you still in bed?

si is the normal unstressed form of to be in the present tense.

Serbian has:

• unstressed/clitic forms: sam, si, je, smo, ste, su
• stressed/full forms: jesam, jesi, jeste...

In a sentence like this, si is the natural choice:

• Zašto si još u krevetu?

The full form jesi is used for emphasis or in patterns like:

• Jesi li dobro? = Are you okay?

So here si is completely normal.

Because u here means location: in bed.

With u, Serbian often uses:

• locative for location: u krevetu = in the bed / in bed
• accusative for movement into something: u krevet = into the bed

So:

• Još si u krevetu = you are still in bed
• Ideš u krevet = you are going to bed

Also, krevetu is the locative singular of krevet.

Because u krevetu usually means in bed in the normal idiomatic sense: lying there, still in bed, not up yet.

• u krevetu = in bed
• na krevetu = on the bed

So if someone is lying or staying in bed, Serbian normally says u krevetu.

Here još means still.

So još u krevetu means still in bed.

This word can have other meanings in other contexts, such as:

• more
• another
• yet

But in this sentence, the natural meaning is still.

Because the verb is oblačiti se, which means to get dressed / to dress oneself.

Compare:

• oblačiti = to dress someone / to put clothes on someone
• oblačiti se = to get dressed

So:

• Majka oblači dete. = The mother dresses the child.
• Dete se oblači. = The child is getting dressed.

In your sentence, the person is dressing themself, so se is required.

Because ne goes directly with the verb, while se is a clitic that tends to come very early in the clause.

So the structure is:

• Zašto se danas ne oblačiš za posao?

Not:

• Zašto ne se oblačiš...

A useful way to think about it:

• se wants an early position
• ne directly negates the verb

That is why the order looks like this.

Because Serbian does not have a separate tense like the English present continuous.

The Serbian present tense can mean both:

• you get dressed
• you are getting dressed

The exact meaning depends on context.

So ne oblačiš se can mean:

• you are not getting dressed
• you do not get dressed

In this sentence, because of the situation, it clearly means you are not getting dressed.

This is about aspect, which is very important in Serbian.

• oblačiti se = imperfective
• obući se = perfective

Very roughly:

• oblačiti se focuses on the process, repeated action, or ongoing activity
• obući se focuses on completing the action

Here the speaker is asking about what is happening right now, so the imperfective oblačiš se is natural.

• Zašto se danas ne oblačiš za posao? = Why aren’t you getting dressed for work today?

A version with obući se would feel more like asking why the person is not going to complete that action.

Because za posao means for work, as in appropriate for work or for the purpose of work.

• oblačiti se za posao = to get dressed for work

By contrast, na posao usually means to work as a destination:

• Idem na posao. = I’m going to work.

So:

• za posao = for work
• na posao = to work

That is an important difference.

Yes. Serbian word order is fairly flexible, and moving danas changes the emphasis slightly.

The original:

• Zašto se danas ne oblačiš za posao?

This puts today fairly early, so it highlights today.

You could also hear:

• Zašto se ne oblačiš danas za posao?

Both are understandable and natural, but the focus is a little different. Serbian often moves words around for emphasis more freely than English does.

Because the sentence is really asking two parallel questions:

• Zašto si još u krevetu?
• i zašto se danas ne oblačiš za posao?

Repeating zašto makes both parts feel equally important and explicit.

You might sometimes hear a version without the second zašto, but repeating it is very natural and clear, especially when the speaker is expressing surprise or annoyance.