Danas radim više nego juče.

Radim already means I work / I am working. The ending -im shows 1st person singular (I), so Serbian usually does not need the pronoun ja.

• Radim = I work / I’m working
• Ja radim = I work / I’m working, but with extra emphasis on I

Also, sam is not used with ordinary present-tense verbs like radim.
Sam is an auxiliary used in forms like the past tense:

• Radio sam = I worked

So in this sentence, Danas radim više nego juče, radim by itself is exactly right.

Radim is in the present tense.

In Serbian, the present tense can often translate into English in more than one way, depending on context:

• radim = I work
• radim = I am working

So Danas radim više nego juče can naturally mean:

• Today I work more than yesterday
• Today I am working more than yesterday
• Today I’m working more than I did yesterday

The exact English version depends on the situation, but the Serbian sentence is completely natural.

Because Serbian often leaves out words that are understood from context.

In English, we often say:

• Today I’m working more than I did yesterday

In Serbian, you do not need to repeat the verb:

• Danas radim više nego juče

The meaning is understood as:

• Today I work more than I worked yesterday

This kind of omission is very common and natural in Serbian.

Here, više means more.

It is the comparative form of mnogo in function, but in practice you should learn više as the normal word for more.

In this sentence, it modifies the verb radim, so it means:

• I work more
• not I am more working

Examples:

• Jedem više. = I eat more.
• Učim više. = I study more.
• Spavam više. = I sleep more.

So više often works like an adverb in English: more.

Nego is used to mean than in comparisons.

So:

• više nego juče = more than yesterday

This is a very common comparison pattern:

• veći nego pre = bigger than before
• brže nego ranije = faster than earlier
• više nego juče = more than yesterday

A very useful rule for learners is:

• use nego when the comparison is with something adverbial, a whole idea, or something that is not just a simple noun phrase
• use od more often with nouns/pronouns in comparisons such as stariji od mene = older than me

Because od juče usually means since yesterday or from yesterday, not than yesterday.

Compare:

• više nego juče = more than yesterday
• od juče = since yesterday / from yesterday

So if you said:

• Danas radim više od juče

many speakers would find that unnatural or confusing, because od juče strongly suggests a time starting point, not a comparison.

That is why nego juče is the natural form here.

No, juče does not change form here.

Juče is an adverb meaning yesterday, not a noun. Because it is an adverb, it does not decline for case in this sentence.

So:

• danas = today
• juče = yesterday

Both are time adverbs and stay the same.

This is one reason the structure is nice for learners: there is no case ending to worry about in nego juče.

Danas means today and sets the time frame for the whole sentence.

So the basic structure is:

• Danas = today
• radim = I work / I’m working
• više = more
• nego juče = than yesterday

Serbian often places time expressions near the beginning of the sentence, especially when they provide the main context.

That said, other word orders are also possible for emphasis, for example:

• Radim danas više nego juče.
• Više radim danas nego juče.

But Danas radim više nego juče is the most neutral and straightforward version.

Yes, you can. It is grammatically correct.

But in Serbian, subject pronouns like ja are often omitted unless you want emphasis, contrast, or clarity.

So:

• Danas radim više nego juče. = neutral
• Ja danas radim više nego juče. = emphasizes I

For example, you might use ja if you are contrasting yourself with someone else:

• Ti odmaraš, a ja danas radim više nego juče. = You’re resting, but I’m working more today than yesterday.

Yes, aspect matters.

Raditi is an imperfective verb. Imperfective verbs are used for:

• ongoing actions
• repeated actions
• general processes
• present tense in ordinary statements

That makes radim the correct choice here.

A perfective verb would not normally be used like this in a simple present-tense sentence about current activity or amount of work. Serbian perfective verbs usually do not form a normal present meaning like English I do / I am doing; their present forms often refer to the future or a completed action in a different sense.

So radim is the natural form because the sentence is about the ongoing amount of work today compared with yesterday.

Yes.

Serbian present tense often covers both the English simple present and present continuous, depending on context.

So radim can mean:

• I work
• I am working

In this sentence, English usually prefers:

• Today I’m working more than yesterday or
• Today I’m working more than I did yesterday

But the Serbian sentence itself does not need to make that distinction explicitly.

The word order can change, but the original sentence is the most neutral.

Neutral version:

• Danas radim više nego juče.

Possible alternatives:

• Radim više danas nego juče.
• Više radim danas nego juče.
• Danas više radim nego juče.

These alternatives may sound slightly different in focus or emphasis, but they are understandable.

For a learner, the safest and most natural version is:

• Danas radim više nego juče.

No, not if you want the same meaning.

• više = more
• bolje = better

So:

• Danas radim više nego juče. = Today I work more than yesterday.
• Danas radim bolje nego juče. = Today I work better than yesterday.

These mean different things:

• više talks about quantity / amount
• bolje talks about quality

Yes, absolutely.

Danas radim više nego juče is short, natural, and idiomatic. A native speaker would understand it immediately.

It sounds like something you might say when talking about:

• workload
• study time
• activity level
• how busy you are today compared with yesterday

So it is a very useful model sentence for learning:

• time expression at the start
• present tense verb
• comparative više
• comparison with nego