Den som är ansvarig måste meddela alla om tiden ändras.

Den som means the one who or whoever.

In this sentence, den som är ansvarig means the person who is responsible.

A few useful points:

• den = the one / that person
• som = who / that

So Swedish uses den som where English often uses:

• the person who ...
• whoever ...
• the one who ...

Example:

• Den som kommer först får kaffe. = The one who arrives first gets coffee.

Because Swedish usually needs the verb att vara (to be) in this kind of sentence.

So:

• är ansvarig = is responsible

Just like in English, you normally say:

• She is responsible not
• She responsible

Here, ansvarig is an adjective, and är links the subject to that adjective.

Ansvarig is an adjective meaning responsible.

In this sentence, it is a predicate adjective, meaning it comes after är and describes the subject:

• Den som är ansvarig = The one who is responsible

Compare:

• en ansvarig person = a responsible person
  Here it comes before a noun.
• personen är ansvarig = the person is responsible
  Here it comes after är.

Because Swedish modal verbs do not use att before the next verb.

Måste is a modal verb, like English must. After modal verbs, Swedish uses the infinitive directly:

• måste meddela = must inform
• kan komma = can come
• vill gå = want to go

Not:

• måste att meddela

This is similar to English:

• must inform not
• must to inform

No. Måste does not change for person or number.

So you say:

• jag måste
• du måste
• han måste
• vi måste
• de måste

This is very common in Swedish: verbs usually do not change depending on who does the action.

Because meddela normally takes a direct object in Swedish.

So:

• meddela alla = inform everyone

You usually do not say meddela till alla.

Compare:

• inform everyone
• tell everyone

Swedish examples:

• Hon meddelade alla nyheten. = She informed everyone of the news.
• Vi måste meddela läraren. = We must inform the teacher.

So alla is the object of meddela.

Alla means everyone or all people here.

It can also mean all depending on context.

In this sentence:

• meddela alla = inform everyone

Compare:

• alla elever = all students
• alla kom = everyone came

So here it stands alone and means everyone.

Here om means if.

So:

• om tiden ändras = if the time changes / if the time is changed

This is a very common Swedish word with more than one meaning:

• om = if
• om = about

Examples:

• Om du kommer, blir jag glad. = If you come, I’ll be happy.
• Vi pratade om filmen. = We talked about the film.

In your sentence, it is clearly the if meaning.

Because ändras is the -s form, which often works like a passive in Swedish.

So:

• tiden ändras = the time is changed

This focuses on the change happening, not on who changes it.

Compare:

• Någon ändrar tiden. = Someone changes the time.
• Tiden ändras. = The time is changed / the time changes.

In everyday Swedish, this -s passive is very common.

Yes. In many contexts, Swedish -s forms can sound natural in English as either:

• is changed or
• changes

The exact English wording depends on context.

Here, since a schedule or arranged time is probably being talked about, English would often express it as:

• if the time changes or
• if the time is changed

Both capture the idea well.

Because subordinate clauses in Swedish do not use the same inversion pattern as main clauses.

After om (if), the clause is subordinate, so the normal order is:

• subject + verb
• tiden ändras

Not:

• ändras tiden

Compare:

Main clause:

• Tiden ändras.

Subordinate clause:

• ... om tiden ändras.

This is an important pattern in Swedish:

• main clauses often have verb-second word order
• subordinate clauses usually keep subject before verb

Because tiden means the time, while tid means time in a more general sense.

Here, the sentence refers to a specific time, such as the scheduled time of a meeting, class, or event.

So:

• tid = time (general)
• tiden = the time (specific)

Examples:

• Jag har inte tid. = I don’t have time.
• Tiden för mötet ändras. = The time for the meeting is changed.

It is natural and correct, and it sounds slightly formal or official because of meddela.

Meddela is a normal word, but it is a bit more formal than some alternatives.

A more everyday version might be:

• Den som är ansvarig måste säga till alla om tiden ändras.

Difference:

• meddela = inform / notify (more formal)
• säga till = tell / let know (more everyday)

Both are correct; the original sentence sounds perfectly natural, especially in written instructions or workplace/school contexts.