Magistra dicit ordinem in cubiculo servandum esse: vestimenta in armario ponenda sunt et sordes statim tollendae sunt.

Because after dicit, Latin commonly uses an indirect statement.

In an indirect statement:

• the subject of the reported idea goes into the accusative
• the verb goes into an infinitive

So ordinem ... servandum esse means something like that order must be kept.

Here ordinem is the accusative subject of the infinitive phrase, not the subject of dicit.

Latin usually does not need a separate word like English that in this kind of sentence.

Instead of saying:

• The teacher says that...

Latin says:

• Magistra dicit
  • accusative + infinitive

So Magistra dicit ordinem in cubiculo servandum esse is the normal Latin way to say The teacher says that order must be kept in the room.

Servandum esse is a gerundive construction expressing necessity or obligation.

It is made of:

• servandum = gerundive of servare
• esse = to be

This combination often means:

• must be kept
• has to be kept
• is to be kept

So ordinem ... servandum esse means that order must be kept.

Because servandum agrees with ordinem.

Ordo, ordinis is masculine, and here ordinem is:

• masculine
• singular
• accusative

The gerundive must match that, so it also becomes:

• masculine
• singular
• accusative

For a 1st/2nd-declension adjective, masculine accusative singular ends in -um, so servandum is exactly what we expect.

No. In this sentence, servare means:

• to keep
• to preserve
• to maintain

So ordinem servare means to keep order or to maintain tidiness, not to serve order.

That is a very common thing for English speakers to trip over, because servare looks similar to English serve, but here the meaning is different.

They are the same basic kind of construction as servandum esse: a gerundive of obligation.

So:

• vestimenta ... ponenda sunt = the clothes must be put away
• sordes ... tollendae sunt = the dirt/mess must be removed

The difference is that these are written as normal finite clauses with sunt, while servandum esse is inside an indirect statement after dicit.

Because the gerundive has to agree with the noun it goes with.

• vestimenta is neuter plural, so we get ponenda
• sordes is feminine plural, so we get tollendae

So the endings change to match gender, number, and case.

This is just adjective agreement, because the gerundive behaves like an adjective.

Vestimenta is the plural of vestimentum, meaning garment or piece of clothing.

So:

• vestimentum = a garment
• vestimenta = clothes / garments

It is a neuter plural noun, which is why the agreeing gerundive is also neuter plural: ponenda.

English often uses clothes as a plural idea, so the Latin plural here feels quite natural.

Because sordes is very often a plural noun in Latin.

So even when English uses a singular word like:

• dirt
• filth
• mess

Latin may use sordes, which is grammatically plural. That is why the sentence has:

• sordes
• tollendae sunt

with plural agreement.

Both phrases use in with the ablative, which usually expresses location:

• in cubiculo = in the room
• in armario = in the wardrobe / closet

A beginner rule is:

• in + ablative = in/on somewhere
• in + accusative = into/onto somewhere

In in cubiculo, that is straightforward location.

With in armario, the sentence is focusing on where the clothes belong or are to be kept. That is why the ablative works naturally here.

Because the first clause is directly dependent on dicit, while the later clauses are presented as explanatory statements after the colon.

So:

• dicit ... servandum esse = indirect statement
• vestimenta ... ponenda sunt = main clause
• sordes ... tollendae sunt = main clause

If you wanted to keep everything inside the indirect statement after dicit, Latin could also say something like:

• vestimenta in armario ponenda esse et sordes statim tollendas esse

But the sentence as written switches to direct explanatory clauses after the colon.

The colon introduces an explanation of what keeping order means in practice.

So the structure is:

• general statement: order must be kept in the room
• specific examples: clothes must be put in the wardrobe and dirt must be removed immediately

It works much like English punctuation here.

Statim means immediately or at once, and it modifies tollendae sunt.

So:

• sordes statim tollendae sunt = the mess must be removed immediately

Latin word order is flexible, so statim can be placed before the gerundive for emphasis. Its position helps highlight the urgency.

The sentence leaves the responsible person unstated because the obligation is general.

That is very common with this construction. Latin does not always need to say who must do the action if the context makes it obvious.

If Latin wanted to name the person responsible, it could use the dative of agent, for example:

• discipulis vestimenta ponenda sunt = the students must put away the clothes
• nobis ordo servandus est = we must keep order

So the sentence is not missing anything essential; it is simply expressing a general rule.