Magistra neminem in bibliotheca clamare patitur.

Because neminem is the direct object of patitur.

But there is an extra point here: with verbs like patior (allow, permit, suffer), Latin often uses an accusative + infinitive pattern. In this sentence:

• neminem = the person being allowed
• clamare = the action being allowed

So neminem clamare literally means no one to shout or more naturally no one to shout / nobody to shout.

In other words, neminem is both:

• the object of patitur, and
• the logical subject of clamare

English often does something similar with allow:

• The teacher allows no one to shout.

Because after patitur Latin uses the infinitive to express what someone is allowed to do.

So:

• patitur = allows
• clamare = to shout

This is very common in Latin. After verbs of causing, allowing, perceiving, saying, thinking, and so on, Latin often uses an infinitive where English might also use one.

So the structure is:

• Magistra = subject
• patitur = main verb
• neminem clamare = no one to shout

Because in takes different cases depending on whether it shows:

• location → ablative
• motion into → accusative

Here the meaning is in the library as a place where the shouting would happen, not into the library. So Latin uses the ablative:

• in bibliotheca = in the library

If it meant motion into the library, it would be:

• in bibliothecam = into the library

It is ablative singular.

You can tell because:

• it follows in
• the meaning is location, not movement
• first-declension nouns often have -a in the ablative singular

So:

• nominative singular: bibliotheca = library
• ablative singular: bibliotheca = in/by/with/from the library, depending on context

The form happens to look the same as the nominative here, which is normal for first-declension nouns.

Because patitur comes from a deponent verb: patior, pati, passus sum.

Deponent verbs:

• have passive forms
• but active meanings

So patitur is formally passive-looking, but it means:

• he/she allows
• he/she suffers
• he/she endures

In this sentence, the meaning is allows.

This is one of the most important things to get used to in Latin: not every passive-looking form is actually passive in meaning.

Magistra is the subject of the sentence.

It is:

• nominative singular
• feminine
• from magistra, meaning female teacher or mistress depending on context

So magistra patitur means:

• the teacher allows

Since the verb is patitur rather than patiuntur, we know the subject is singular, which matches magistra.

Not exactly. Neminem is the accusative of nemo, which means no one or nobody.

Its forms are a bit irregular, so it is best learned as its own word rather than as a simple negative version of something else.

Here:

• nemo = no one
• neminem = no one / nobody, in the accusative

So neminem clamare means no one to shout or nobody to shout.

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

So this sentence could be rearranged in different ways without changing the basic meaning, for example:

• Magistra neminem in bibliotheca clamare patitur
• Neminem magistra in bibliotheca clamare patitur
• In bibliotheca magistra neminem clamare patitur

The differences would mostly be about emphasis, not basic grammar.

The given order is perfectly natural, with patitur at the end, which is very common in Latin.

It can mean any of those depending on context.

The basic idea of clamo is shout / cry out / call loudly. In this sentence, to shout is probably the most natural English choice because of the setting:

• in bibliotheca = in the library

So the context strongly suggests loud noise, which makes shout a very good translation.

Yes, but not in exactly the same way as after verbs of saying and thinking.

It is still useful to recognize it as a type of accusative + infinitive structure:

• neminem = accusative
• clamare = infinitive

Together they form the idea no one to shout.

With verbs like dicit, putat, audit, iubet, patitur, and others, Latin often uses an accusative noun or pronoun plus an infinitive. The precise force depends on the main verb:

• after saying/thinking: indirect statement
• after ordering/allowing: the person affected + the action
• after perception: the person perceived + the action

So this sentence is not an indirect statement, but it does use the same basic accusative-plus-infinitive pattern.

In theory, patior can mean suffer, endure, or allow depending on context.

But here allows is clearly the better meaning.

Why?

Because the construction someone + infinitive after patitur naturally gives the sense allow someone to do something. So:

• neminem clamare patitur = she allows no one to shout

If you tried to force suffers here, English would sound strange unless you rephrased it, something like she tolerates no one shouting, which is really close in meaning to allows no one to shout anyway.