Magister discipulos iubet exercitium breve in charta scribere.

Because magister is the subject of the sentence: the teacher is the one doing the ordering. In Latin, the subject is normally in the nominative case.

• magister = the teacher
• nominative singular, masculine

So magister iubet means the teacher orders.

Because with iubeo (to order), the person being ordered is usually put in the accusative. So:

• magister = the one giving the order
• discipulos = the students, the people being ordered
• scribere = the action they are told to do

This is a very common Latin pattern:

someone + iubeo + person in accusative + infinitive

So magister discipulos iubet scribere = the teacher orders the students to write.

Because after iubet, Latin normally uses an infinitive to express the action ordered.

In English we say:

• The teacher orders the students to write

Latin does not need a separate word like to in the same way. The infinitive scribere already covers that idea.

So:

• iubet = orders
• scribere = to write

Together: orders ... to write

In a sense, it is both.

Grammatically, discipulos is the accusative used with iubet. But semantically, it is also the understood subject of scribere, because the students are the ones who are supposed to write.

So the sentence works like this:

• magister = subject of iubet
• discipulos = the students whom the teacher orders
• scribere = what those students are to do

A natural English way to understand it is:

The teacher orders the students [to write].

Because exercitium is the direct object of scribere.

The students are told to write what?
Answer: exercitium breve = a short exercise

So there are two accusatives in the sentence, but they do different jobs:

• discipulos = the people ordered, with iubet
• exercitium = the thing being written, with scribere

This is a good example of how Latin cases depend on the role a word plays, not just on its position in the sentence.

Because breve agrees with exercitium.

• exercitium is neuter singular
• therefore the adjective describing it must also be neuter singular

So:

• masculine/feminine form: brevis
• neuter form: breve

Since exercitium is a neuter noun, Latin uses breve.

Charta is in the ablative singular because it follows in in a location sense.

Latin in can take two different cases:

• accusative = motion into / onto
• ablative = location in / on

Here the meaning is not into the paper, but on paper or on a sheet of paper, so Latin uses the ablative:

• in charta = on paper / on a paper sheet

Here it most naturally means on paper or on a sheet of paper.

English and Latin do not always use prepositions in exactly the same way. Latin in with the ablative can sometimes be translated with English in, on, or even something similar depending on context.

So in this sentence, in charta scribere means writing something down on paper, not physically inside a newspaper or document.

Latin word order is much freer than English word order because the endings show the grammatical roles.

Placing scribere at the end is very natural Latin style. The infinitive often comes after the words connected with it, and Latin often puts important or completing information toward the end.

So although English strongly prefers:

The teacher orders the students to write a short exercise on paper,

Latin can arrange the words more flexibly:

Magister discipulos iubet exercitium breve in charta scribere.

The meaning stays clear because of the case endings.

Yes, often they could.

For example, Latin could move parts around for emphasis without changing the basic meaning, as long as the endings remain clear. For instance, a sentence like:

Magister exercitium breve discipulos in charta scribere iubet

would still be understandable.

That said, not every rearrangement sounds equally natural. The original sentence is a normal and clear way to say it.

So an important lesson is:

• English relies heavily on word order
• Latin relies much more on endings

Because after iubeo, the normal construction is usually accusative + infinitive.

So Latin prefers:

• discipulos scribere iubet = he orders the students to write

rather than a clause with ut.

A learner often meets ut clauses after verbs of urging, asking, or bringing about, but iubeo usually takes this simpler infinitive construction instead.

A learner might want to identify each word like this:

• magister ← magister, magistri = teacher
• discipulos ← discipulus, discipuli = student, pupil
• iubet ← iubeo, iubere, iussi, iussus = order
• exercitium ← exercitium, exercitii = exercise
• breve ← brevis, breve = short, brief
• charta ← charta, chartae = paper, sheet of paper
• scribere ← scribo, scribere, scripsi, scriptus = write

Knowing the dictionary form helps you see why the sentence uses these particular endings.

The core pattern is:

Magister discipulos iubet scribere.
= The teacher orders the students to write.

Then Latin adds more detail about what they are to write and where:

• exercitium breve = a short exercise
• in charta = on paper

So the full structure is:

subject + iubeo + person ordered + thing to be done (infinitive) + object/details of that infinitive

That makes the sentence a very useful model for similar Latin sentences.