Magistra pueros monet ne in solitudine nimis longe a via discedant.

The sentence breaks down like this:

• Magistra = the teacher, the subject
• pueros = the boys, the direct object of monet
• monet = warns/advises
• ne ... discedant = the content of the warning: that they should not go away

So the overall structure is:

The teacher warns the boys not to go too far from the road when in solitude / in a lonely place.

Because magistra is the subject of the main verb monet.

Latin uses the nominative case for the subject of a sentence. Here, magistra is the person doing the warning, so it must be nominative.

Because pueros is the direct object of monet.

The teacher is warning the boys, so pueros is in the accusative after monet. At the same time, those same boys are understood as the subject of discedant.

English does something similar in meaning:

• The teacher warns the boys not to go...

The boys are the object of warns, but they are also the ones who are supposed not to go.

Because its subject, magistra, is singular.

Monet is third person singular present active indicative of moneo. It means she warns, the teacher warns, or is warning, depending on context.

Because ne introduces a negative command/warning clause after a verb like monet.

A very common Latin pattern is:

• moneo aliquem ne + subjunctive
• warn someone not to ...

So:

• pueros monet ne discedant
• she warns the boys not to go away

This is why Latin does not use an infinitive here the way English does.

Because after monet, Latin normally uses ne + subjunctive for the action being warned against.

So discedant is not a plain statement like they go away. It is part of the warning: that they should not go away or more naturally not to go away.

This is a standard construction in Latin, often called an indirect command or substantive clause after a verb of warning/advising.

Because the main verb is present: monet.

After a present main verb, Latin normally uses the present subjunctive for an action that is happening at the same time or is still in the future relative to the main verb.

So:

• monet ... discedant
• warns ... not to go

If the main verb were past, Latin would often use the imperfect subjunctive instead.

Because its understood subject is the boys.

Even though pueros is accusative in the main clause, it is still the people referred to in the subordinate clause. So the verb must be third person plural:

• discedant = they should go away / they are to go away

Here, with ne, it means they should not go away.

Literally, it means in solitude.

Depending on context, it can sound more natural in English as:

• when alone
• in a lonely place
• in the wilderness
• in isolation

The exact nuance depends on the wider passage. A learner should notice that solitudo can refer not just to the feeling of solitude, but also to an isolated or deserted place.

Because it follows in meaning in or within, which takes the ablative for location.

So:

• in solitudine = in solitude / in a lonely place

Compare this with in + accusative, which usually means motion into something. Here there is no motion into solitude; it is a location or situation.

It means too far.

Both words are adverbs:

• nimis = too much, excessively
• longe = far

Together they modify discedant:

• ne ... nimis longe ... discedant
• not to go too far ...

Because discedere often takes a/ab + ablative to mean go away from or move away from.

So:

• a via = from the road

Here:

• discedant a via = they should move away from the road
• with ne: they should not move too far away from the road

Because Latin usually chooses a different construction after moneo.

English says:

• warns the boys not to go

Latin says:

• monet ne discedant

So instead of not to go, Latin uses ne + subjunctive. This is one of those places where Latin grammar does not match English grammar directly, even though the meaning is the same.

Yes, but not in the sense that English word order is fixed.

Latin word order is flexible, and this sentence is quite natural:

• Magistra comes first, introducing the person acting.
• pueros monet keeps the object and main verb close together.
• ne immediately signals the warning clause.
• discedant comes at the end, which is very common in Latin.

So the order helps the sentence flow, but the cases and verb endings carry the grammar more than the position does.

All three are possible meanings of moneo in different contexts, but here warns is the best fit.

Because the sentence has ne + subjunctive, the idea is clearly:

• she warns/advises the boys not to go too far from the road

Reminds would be possible only in a different context, but this sentence sounds more like a caution or warning.

Because Latin often leaves subject pronouns unstated when the verb ending already shows the person and number.

The ending -ant tells you this is third person plural, so they is built into the verb:

• discedant = they should go away

The sentence does not need a separate ei or illi, because the reference is already clear from pueros and the plural verb.