Mater mappam in armarium mittit, ne canis eam capiat.

Because mappam is the direct object of mittit. It is the thing being sent/thrown/put, so it has to be in the accusative case.

• mappa = a cloth, napkin, towel
• mappam = the cloth/napkin/towel as the object of the verb

A native English speaker may not expect this, because English usually shows the object by word order rather than by changing the noun’s ending.

Because in can take either the accusative or the ablative, depending on the meaning.

Here it means into the cupboard/cabinet, showing motion toward a place, so Latin uses the accusative:

• in armarium = into the cupboard

If it meant in the cupboard with no movement, Latin would normally use the ablative:

• in armario = in the cupboard

So this is a very important contrast:

• accusative after in = movement into
• ablative after in = location in

The basic meaning of mittit is sends, but in many contexts it can also mean puts, throws, or dispatches, depending on what is being moved and where.

In this sentence, since the mother is moving the cloth into the cupboard, mittit is being used in a practical sense like:

• puts
• throws
• sends

Latin often uses verbs a little more broadly than English would. So even if English might prefer puts, Latin can still use mittit.

Grammatically, mittit is:

• 3rd person singular
• present tense
• active voice

So it means she puts/sends.

Because ne canis eam capiat is a subordinate clause explaining the purpose of the main action.

The sentence is basically:

• main clause: Mater mappam in armarium mittit
• purpose clause: ne canis eam capiat

The comma helps separate those two parts in English-style punctuation. Latin manuscripts in antiquity did not always use punctuation the way modern editions do, but in modern printed Latin this comma is very normal and helpful.

Here ne means so that ... not or lest. It introduces a negative purpose clause.

So:

• ut
  • subjunctive = so that
• ne
  • subjunctive = so that ... not

That is different from non, which simply negates a word or statement.

Examples:

• venit ut videat = he comes so that he may see
• venit ne videat = he comes so that he may not see

In your sentence:

• ne canis eam capiat = so that the dog does not catch it

So ne is not just a general not; it is the normal word for negative purpose.

Because it is in a purpose clause introduced by ne.

Latin normally uses:

• ut
  • subjunctive for positive purpose
• ne
  • subjunctive for negative purpose

So capiat is subjunctive because the clause expresses the mother’s goal/intention, not a plain statement of fact.

Compare:

• canis eam capit = the dog catches it
  → this is a straightforward statement
• ne canis eam capiat = so that the dog may not catch it
  → this expresses purpose

This is one of the most common uses of the Latin subjunctive, and English often translates it with may, might, or just plain English purpose wording.

Because after a main verb in the present tense like mittit, Latin normally uses the present subjunctive in a purpose clause. This follows the sequence of tenses.

• main verb: mittit = present
• subordinate purpose verb: capiat = present subjunctive

If the main verb were in a past tense, Latin would usually use the imperfect subjunctive instead:

• Mater mappam in armarium misit, ne canis eam caperet.

So capiat is the expected tense here.

Because canis is the subject of capiat.

The clause means:

• the dog may catch it

So canis has to be in the nominative case, because it is doing the action of catching.

The word ne does not force a special case on canis. It simply introduces the clause. The subject inside that clause still works normally.

Eam is the accusative singular feminine form of the pronoun meaning her/it.

Here it refers back to mappam. Since mappa is a feminine singular noun, the pronoun that refers to it must also be feminine singular.

So:

• mappam = the cloth/napkin/towel
• eam = it

It is accusative because it is the direct object of capiat.

This is a very common Latin feature: pronouns must agree with the noun they refer to in gender and number, while their case depends on their role in their own clause.

It certainly could repeat the noun, but Latin often uses a pronoun when the reference is already clear.

So instead of saying something like:

• ne canis mappam capiat

it uses:

• ne canis eam capiat

That is perfectly natural and avoids repetition. English does the same thing:

• Mother puts the cloth in the cupboard so that the dog does not catch it.

Yes, the word order is normal Latin.

Latin word order is much freer than English word order because Latin uses case endings to show grammatical relationships. English depends much more on position.

This sentence is arranged in a very natural Latin way:

• Mater first: the topic/subject
• mappam before the verb: the object is introduced early
• in armarium before mittit: destination before the verb
• ne canis eam capiat at the end: the purpose clause follows the main clause

A more English-like order is not necessary in Latin, because the endings already tell you what each word is doing.

Yes. That is a very good literal-style translation.

Two common ways to translate it are:

• so that the dog does not catch it
• lest the dog catch it

Lest is closer to the traditional Latin grammar explanation, but it sounds more formal or literary in modern English. For most learners, so that the dog does not catch it is the clearest translation.

Yes. Mater is the subject of the main clause, and its form here is nominative singular.

This is one of those nouns whose nominative singular does not end in -a, even though it is feminine. That can surprise English-speaking beginners, especially if they have learned that many first-declension feminine nouns end in -a.

But mater belongs to a different declension. Its basic forms are:

• mater = mother
• matris = of the mother

So the learner should not assume that all feminine nouns look like puella or mensa.

Probably two major points:

1. Motion into a place

   • in
     • accusative = into
   • in armarium = into the cupboard

2. Negative purpose clause

   • ne
     • subjunctive
   • ne canis eam capiat = so that the dog does not catch it

So the sentence is a good example of how Latin combines case endings and the subjunctive to express ideas that English often handles with word order and extra helper words.