Discipula sententiam iterum describere cogitur, quia duo menda in charta sunt.

Discipula is in the nominative singular, which is the case normally used for the subject of a Latin sentence. The ending -a here shows it is a first-declension feminine noun.

So discipula means the female student / schoolgirl as the one doing—or in this case undergoing—the main action.

Sententiam is the direct object of describere. It is the thing that must be rewritten or copied out.

The base form is sententia, but the -am ending shows the accusative singular. In Latin, the direct object is very often put in the accusative.

So:

• sententia = a sentence, opinion, thought
• sententiam = the sentence, as the object

Because it depends on cogitur.

Latin often uses a verb like cogo with an infinitive to express forcing someone to do something. So:

• cogitur = she is forced
• describere = to rewrite / to copy out

Together, they mean she is forced to rewrite.

This is very similar to English: is forced to write, is compelled to do, and so on.

Cogitur is the third-person singular present passive indicative of cogere, meaning to force or compel.

Its parts are:

• cog- = the verb stem
• -i- = part of the present passive formation in this conjugation
• -tur = he/she/it is ...-ed

So cogitur literally means she is forced or she is compelled.

Because the subject is discipula, we understand it as the schoolgirl is forced.

Latin is focusing on what happens to the student, not on who is doing the forcing.

In English, we often do the same thing:

• The student is forced to rewrite the sentence

Latin could mention the person who forces her, but it does not have to. If the agent were included, Latin would normally use a/ab with the ablative:

• Discipula a magistro cogitur = The student is forced by the teacher

Here, the sentence leaves the agent unstated.

Iterum means again.

It is placed before describere, so the sense is to rewrite / to copy out again. Latin word order is more flexible than English word order, so iterum could appear in different places without changing the basic meaning much.

Its position here is natural and helps emphasize that the action must be repeated.

Quia means because. It introduces the reason for the first clause.

So the structure is:

• Discipula ... cogitur = the student is forced ...
• quia ... sunt = because ...

This is a straightforward causal clause. Latin commonly uses quia for an ordinary factual reason.

Because menda is neuter plural.

The numeral two in Latin changes by gender:

• duo = masculine or neuter nominative plural
• duae = feminine nominative plural

The singular noun is mendum, a neuter noun. Its plural is menda. Since the noun is neuter, the numeral must agree with it, so Latin uses duo menda.

This may feel strange to English speakers because duo often looks masculine at first, but here it is also the correct neuter form.

Menda is the nominative plural of mendum, meaning mistake, fault, or error.

Since the sentence says there are two of them, Latin uses the plural:

• mendum = one mistake
• menda = mistakes

It is plural because sunt is plural as well: there are two mistakes.

Because its subject is duo menda, which is plural.

Sunt is the third-person plural present of esse, meaning to be. So:

• est = is
• sunt = are

Since there are two mistakes, Latin correctly uses sunt: two mistakes are.

Charta is in the ablative singular because in with the ablative usually expresses location: in / on something.

So:

• in charta = on the paper or in the paper, depending on context

Here the natural meaning is on the paper.

This is an important pattern:

• in
  • ablative = location
• in
  • accusative = motion into

For example:

• in charta = on the paper
• in chartam = onto the paper / into the paper

It can, but not always.

Sententia has a wide range of meanings, including:

• opinion
• thought
• judgment
• statement
• sometimes sentence

In a classroom context like this one, sentence is a very natural meaning. But learners should know that the word is broader than the English word sentence.

Literally, describere often means to copy off, write out, or transcribe. In context, it can be translated as rewrite if the student has to write the sentence again because of mistakes.

So depending on context, English might say:

• copy out again
• write out again
• rewrite

The Latin itself suggests the idea of writing it out again from a model or original.

Because Latin has no articles.

English must choose between:

• a student
• the student

Latin simply says discipula, and the context tells you whether it should be understood as a student, the student, or sometimes just student in a general sense.

The same is true for:

• sententiam
• charta
• menda

So when translating, English has to add articles, but Latin does not.

The word order matters more for emphasis and style than for basic grammar.

Latin uses endings to show grammatical roles, so it does not rely on word order as heavily as English does. In this sentence:

Discipula sententiam iterum describere cogitur, quia duo menda in charta sunt.

the order is quite natural:

• subject first: discipula
• object next: sententiam
• adverb: iterum
• infinitive + main verb: describere cogitur
• reason clause after that

A different order could still be grammatical, but it might sound more marked or emphasize different words.