Danas nosim jaknu, jer pada sneg.

Because jaknu is the accusative singular form of jakna.

• jakna = nominative singular, the dictionary form
• jaknu = accusative singular

In this sentence, jaknu is the direct object of nosim (I am wearing / I wear), so Serbian uses the accusative:

• Nosim jaknu. = I’m wearing a jacket.

For many feminine nouns ending in -a, the accusative singular changes to -u:

• knjiga → knjigu
• torba → torbu
• jakna → jaknu

Nosim is the 1st person singular present tense of nositi.

So:

• nosim = I wear / I am wearing / I carry / I am carrying

In this sentence, it means I’m wearing.

A useful mini-pattern:

• ja nosim = I wear
• ti nosiš = you wear
• on/ona/ono nosi = he/she/it wears
• mi nosimo = we wear
• vi nosite = you (plural/formal) wear
• oni/one/ona nose = they wear

Because Serbian often drops subject pronouns when they are not needed.

The verb ending already tells you who the subject is:

• nosim clearly means I wear / I am wearing

So ja is optional:

• Danas nosim jaknu. = normal, natural
• Ja danas nosim jaknu. = also correct, but ja adds emphasis

You would include ja if you want contrast or emphasis, for example:

• Ja nosim jaknu, a ti ne. = I’m wearing a jacket, but you aren’t.

It can mean more than just wear.

Nositi commonly means:

• to wear clothes
• to carry something
• sometimes more abstract meanings depending on context

Examples:

• Nosim jaknu. = I’m wearing a jacket.
• Nosim torbu. = I’m carrying a bag.

So the context tells you which meaning is intended. Since the object is jaknu and the sentence talks about snow, wearing is the natural meaning here.

Literally, pada sneg means snow is falling.

That is a normal Serbian way to express it’s snowing:

• Pada sneg. = It’s snowing.

English uses the dummy subject it, but Serbian does not need that kind of subject here. Instead, sneg is the actual subject:

• sneg = snow
• pada = falls / is falling

You may also hear:

• Sneži. = It’s snowing.

Both are natural, though pada sneg is very transparent for learners because it literally describes the action.

Pada is the 3rd person singular present tense of padati.

Here it agrees with sneg, which is singular:

• sneg pada / pada sneg = snow is falling

So:

• padam = I fall / am falling
• padaš = you fall
• pada = he/she/it falls

In this sentence, it is best understood as is falling, because the action is happening now.

Because sneg is the subject of pada.

In pada sneg, the thing doing the falling is snow, so Serbian uses the nominative:

• sneg = nominative singular

This is different from jaknu, which is the direct object and therefore accusative.

So the structure is:

• Danas = today
• nosim = I wear / am wearing
• jaknu = jacket (accusative object)
• jer = because
• pada = falls / is falling
• sneg = snow (nominative subject)

Because jer introduces a subordinate clause meaning because, and in standard Serbian it is normally separated by a comma.

So:

• Danas nosim jaknu, jer pada sneg.

This comma is standard and expected in writing.

Very roughly, it works like English in sentences such as:

• I’m wearing a jacket, because it’s snowing.

In natural English, that comma is often omitted, but in Serbian the comma before jer is much more regular.

Yes. Jer and zato što can both mean because.

So you can say:

• Danas nosim jaknu, jer pada sneg.
• Danas nosim jaknu zato što pada sneg.

Both are correct. A simple learner-friendly way to think about them:

• jer = shorter, very common
• zato što = also common, slightly more explicit

In many everyday sentences, they are interchangeable.

It can cover both, depending on context.

Serbian present tense often corresponds to both:

• I wear a jacket
• I am wearing a jacket

In this sentence, because of danas (today) and the weather explanation, the natural English translation is usually:

• Today I’m wearing a jacket, because it’s snowing.

So Serbian does not force the same simple/continuous distinction that English does here.

Yes. Serbian word order is fairly flexible, although some orders sound more natural than others depending on emphasis.

The given sentence is very natural:

• Danas nosim jaknu, jer pada sneg.

But you could also hear:

• Nosim jaknu danas, jer pada sneg.
• Jer pada sneg, danas nosim jaknu.

The basic meanings stay the same, but the focus changes a little. Serbian often uses word order to highlight information rather than to mark basic grammatical roles.

For a learner, the original version is a very good neutral model.

Because Serbian has no articles.

English has:

• a jacket
• the jacket

Serbian usually just says:

• jakna / jaknu

The context tells you whether the meaning is more like a jacket, the jacket, or simply jacket in a general sense.

So:

• Nosim jaknu. can mean I’m wearing a jacket or I’m wearing the jacket, depending on context.

Yes, both nosim (from nositi) and pada (from padati) are imperfective forms, and that fits the sentence well.

Imperfective verbs are used for:

• ongoing actions
• repeated actions
• general situations

Here the meaning is ongoing/current:

• I’m wearing a jacket
• snow is falling

That is why imperfective forms are natural.

Very simply:

• nositi = to wear / carry, ongoing or repeated
• padati = to fall, ongoing or repeated

So this sentence describes a present situation, not a completed event.