Ja idem u grad.

Yes. In Serbian, the verb ending already tells you the subject, so idem by itself means I go / I’m going.

That means:

• Idem u grad. = perfectly natural
• Ja idem u grad. = also correct, but ja adds emphasis, contrast, or clarity

For example:

• Idem u grad. = neutral statement
• Ja idem u grad, a on ostaje kod kuće. = I’m going to town, but he is staying home

So in many situations, ja can be omitted.

Idem is the 1st person singular present tense of the verb ići (to go).

So the basic pattern is:

• ja idem = I go / I am going
• ti ideš = you go
• on / ona / ono ide = he / she / it goes
• mi idemo = we go
• vi idete = you go
• oni / one / ona idu = they go

A learner may notice that ići is somewhat irregular, so it is worth memorizing.

Because u can take different cases depending on whether it shows:

• movement toward a place → accusative
• location in a place → locative

Here, idem shows movement, so Serbian uses the accusative:

• Idem u grad. = I’m going to town / the city

But with location:

• Ja sam u gradu. = I am in town / in the city

So:

• u grad = into / to the city (destination)
• u gradu = in the city (location)

Here, grad is in the accusative singular.

For this noun, the forms are:

• nominative: grad
• accusative: grad
• locative: gradu

Since grad is a masculine inanimate noun, its accusative singular is the same as its nominative singular. That is why the form stays grad.

It can mean city or town, depending on context.

In everyday speech, idem u grad is a very common expression and often means something like:

• going into town
• going downtown
• going to the city center
• going out into the main urban area

So even if the literal meaning is I’m going to the city/town, the natural sense depends on the situation.

Yes — and very often that is the more natural choice.

Serbian usually drops subject pronouns unless there is a reason to include them, such as:

• emphasis
• contrast
• avoiding ambiguity

So in ordinary conversation, Idem u grad is extremely common.

It can mean either, depending on context.

The Serbian present tense often covers both:

• a general/habitual meaning: I go to town
• an action happening now or very soon: I’m going to town

Context tells you which one is intended.

For example:

• Svake subote idem u grad. = I go to town every Saturday
• Zdravo, idem u grad sad. = Hi, I’m going to town now

Yes. Very often.

Serbian frequently uses the present tense for a planned or immediate future action, especially with verbs of motion.

So Ja idem u grad can naturally mean:

• I’m going to town now
• I’m heading into town
• I’m going to town later today

If you want a more explicit future, Serbian also has future forms, for example:

• Ići ću u grad. = I will go to town

But in everyday speech, the present tense is very common for near-future plans.

Yes, Serbian word order is relatively flexible.

The neutral order here is:

• Ja idem u grad.

But other orders are possible, depending on emphasis:

• Idem u grad. = neutral, very common
• U grad idem. = emphasizes the destination
• Ja u grad idem. = possible, but more marked or contrastive

So the given order is natural and basic, but not the only possible one.

The dictionary form is ići, meaning to go.

This is the infinitive. Serbian dictionaries normally list verbs in the infinitive, so if you want to look up idem, you need to know that it comes from ići.

This is one reason learners memorize verbs like this:

• ići → idem
• doći → dođem
• otići → odem

A simple pronunciation guide is:

ya EE-dem oo grahd

A few details:

• j in Serbian sounds like English y
  • ja ≈ ya
• i is like ee in see
  • idem begins with ee
• u is like oo in food
• grad has a rolled or tapped r in careful Serbian pronunciation, though learners usually start with a light r

The stress is roughly:

• JA i-dem u GRAD

Exact stress patterns can vary by region and speech style, but that approximation is good for a beginner.

Not always, but it is the normal one for going into / to many enclosed or defined places, including grad here.

For example:

• idem u školu = I’m going to school
• idem u kuću = I’m going into the house
• idem u grad = I’m going to town / into the city

But Serbian also uses other prepositions in different situations, such as:

• na fakultet = to the faculty/college
• na posao = to work
• na more = to the seaside

So prepositions must often be learned together with the noun or expression. For grad, u grad is the normal form when talking about going there.