Povratak je u sedam.

Povratak is a noun meaning return, coming back, or the return trip/backward movement, depending on context.

In this sentence it is the subject of the sentence:

• Povratak = the return
• je = is
• u sedam = at seven

It is in the nominative singular form.

Je is the 3rd person singular present of the verb biti (to be).

It links the subject povratak with the time expression:

• Povratak je u sedam. = The return is at seven.

English also uses is in this kind of sentence, so the structure is fairly similar.

In Serbian, an exact clock time is usually expressed with u + the appropriate case, very often the accusative:

• u pet = at five
• u sedam = at seven
• u deset = at ten

So u sedam is the normal way to say at seven.

After u in the meaning of at a specific time, Serbian uses the accusative.

So in u sedam, sedam is functioning as an accusative time expression.

A useful thing for learners: with many numerals like sedam, the form often looks the same, so you do not see a visible change here.

Normally, for a specific time, Serbian uses u:

• Povratak je u sedam.

Without u, it would usually sound incomplete or nonstandard in ordinary speech for this meaning.

So if you mean at seven o’clock, keep u.

Serbian does not have articles like English a and the.

So povratak can mean:

• a return
• the return

Which one is meant depends on the context. In this sentence, English will often use the return because the event is probably already known.

Yes. Serbian word order is more flexible than English.

The neutral version is:

• Povratak je u sedam.

But you could also say:

• U sedam je povratak.

That version puts more emphasis on the time at seven.

Both are grammatical; the difference is mainly in focus and style.

Yes, it is natural, especially in contexts like:

• schedules
• travel plans
• event programs
• announcements

It sounds a bit formal or schedule-like, because povratak is a noun.

In everyday conversation, people might also use a verb-based sentence such as:

• Vraćamo se u sedam. = We’re coming back at seven.
• Vraćam se u sedam. = I’m coming back at seven.

Povratak is a noun: return.

Vraćamo se is a verb phrase: we are returning / we’re coming back.

Compare:

• Povratak je u sedam. = The return is at seven.
• Vraćamo se u sedam. = We’re coming back at seven.

The noun version sounds more like a planned event or item on a timetable. The verb version sounds more personal and conversational.

Yes. You can say:

• Povratak je u sedam.
• Povratak je u sedam sati.

Both mean the same thing.
U sedam is very common and natural in everyday speech.
U sedam sati is a little more explicit and can sound slightly more formal or careful.

In standard full sentences, je should stay:

• Povratak je u sedam.

In notes, headlines, timetables, or very compressed style, Serbian sometimes drops forms of to be, but that is not the normal full-sentence pattern learners should copy first.

So the safe standard form is:

• Povratak je u sedam.

Not always. Povratak can mean several kinds of return, depending on context:

• returning from a trip
• a comeback
• restoration or return to a place/state

In Povratak je u sedam, the most likely meaning is a scheduled physical return, such as on a trip or outing.

You negate je with nije:

• Povratak nije u sedam. = The return is not at seven.

That is the regular way to make this sentence negative.