Magistra dicit puerum nimis celeriter scribere, et ideo saepius errare.

Because this sentence uses an indirect statement after dicit.

In English, we say:

• The teacher says that the boy writes too quickly.

In classical Latin, after verbs like dicit (says), Latin often puts:

• the subject of the reported statement in the accusative
• the verb of the reported statement in the infinitive

So:

• puerum ... scribere = that the boy writes / is writing

Even though the boy is logically the subject of scribere, in Latin grammar it appears in the accusative because it is the subject of an indirect statement.

This is the accusative-and-infinitive construction, often abbreviated AcI.

Its pattern is:

• a verb of saying, thinking, knowing, perceiving, etc.
• then an accusative noun
• then an infinitive

Here:

• Magistra = the teacher
• dicit = says
• puerum = the boy, in the accusative
• scribere = to write
• errare = to make mistakes / to err

So the structure means:

• The teacher says [the boy to write too quickly and therefore to make mistakes more often]
• more naturally in English: The teacher says that the boy writes too quickly, and therefore makes mistakes more often.

They are infinitives because they are part of the indirect statement after dicit.

In direct speech, you might have something like:

• Puer nimis celeriter scribit et ideo saepius errat.
• The boy writes too quickly and therefore makes mistakes more often.

When this becomes indirect after dicit, Latin changes:

• puer → puerum
• scribit → scribere
• errat → errare

So:

• Magistra dicit puerum nimis celeriter scribere, et ideo saepius errare.

That is a very normal Latin way to report what someone says.

Yes.

Latin does not need to repeat puerum here. It is understood as the subject of both infinitives:

• puerum ... scribere
• (puerum) ... errare

So the sense is:

• The teacher says that the boy writes too quickly and therefore makes mistakes more often.

This is common in Latin: once the accusative subject is clear, it can govern more than one infinitive.

Because celeriter is an adverb, while celer is an adjective.

• celer = quick, describing a noun
• celeriter = quickly, describing a verb

Here the word modifies scribere (to write), so Latin needs the adverb:

• nimis celeriter scribere = to write too quickly

If you used celer, it would need to describe a noun, such as:

• puer celer est = the boy is quick

But here we are describing how he writes, not what kind of boy he is.

Nimis means too much or too, depending on the context.

Here it modifies the adverb celeriter, so:

• nimis celeriter = too quickly

This is different from something like very quickly. Latin often uses:

• valde celeriter = very quickly
• nimis celeriter = too quickly

So nimis suggests excess: the boy is writing at a speed that causes a problem.

Saepius is the comparative adverb of saepe.

• saepe = often
• saepius = more often

So:

• ideo saepius errare = therefore to make mistakes more often

The comparative makes sense because the idea is causal: because he writes too quickly, he makes mistakes more often than he otherwise would.

A learner may notice that English sometimes translates saepius a little loosely depending on context, but grammatically it is comparative: more often.

Ideo is an adverb meaning therefore, for that reason, or because of that.

It connects the two ideas:

• he writes too quickly
• therefore he makes mistakes more often

So the logic is:

1. nimis celeriter scribere = to write too quickly
2. et ideo saepius errare = and therefore to make mistakes more often

Ideo is signaling result.

Because et links the two infinitive phrases, while ideo adds the idea of consequence.

So:

• et = and
• ideo = therefore

Together:

• and therefore

This is a very natural combination in Latin, just as it is in English.

The basic order here is quite natural, but Latin word order is flexible.

The sentence is:

• Magistra dicit puerum nimis celeriter scribere, et ideo saepius errare.

A rough breakdown:

• Magistra = subject
• dicit = main verb
• puerum = subject of the indirect statement
• nimis celeriter = adverb phrase
• scribere = infinitive
• et ideo saepius errare = second infinitive phrase

Latin could rearrange many of these words for emphasis without changing the core meaning, as long as the grammar remains clear. For example, puerum could appear later, or nimis could be placed differently. But this version is straightforward and readable.

They are present infinitives.

In an indirect statement, the tense of the infinitive is usually understood relative to the main verb:

• present infinitive = action happening at the same time as the main verb
• perfect infinitive = action earlier than the main verb
• future infinitive = action later than the main verb

So here:

• dicit ... scribere ... errare
• she says that he writes / is writing ... and makes / is making mistakes ...

The idea is that these actions are contemporaneous with dicit.

Sometimes later or less formal Latin can use a clause with quod or quia meaning that, but in classical Latin, after a verb like dicit, the normal construction is the accusative and infinitive.

So classical Latin strongly prefers:

• Magistra dicit puerum ... scribere

rather than a finite clause meaning The teacher says that...

For a learner, it is best to recognize this as the standard classical way to report speech or thought.

A quick parsing:

• Magistra: nominative singular, feminine, the teacher
• dicit: 3rd person singular present active of dicere, says
• puerum: accusative singular of puer, boy
• nimis: adverb, too
• celeriter: adverb, quickly
• scribere: present active infinitive of scribere, to write
• et: and
• ideo: adverb, therefore
• saepius: comparative adverb from saepe, more often
• errare: present active infinitive of errare, to err / make mistakes

This is a good sentence for seeing how several simple pieces work together in a very typical Latin structure.