Mater apud lectum pueri vigilat.

• Mater = mother
• apud = at, by, near
• lectum = bed
• pueri = of the boy / the boy’s
• vigilat = is awake, keeps watch, or stays awake

So the sentence means something like The mother is keeping watch by the boy’s bed.

Because apud is a preposition that takes the accusative.

So:

• lectus = bed as a basic dictionary form
• lectum = bed in the accusative singular

After apud, Latin requires the accusative:

• apud lectum = at the bed / by the bed

This is just something you learn with the preposition: apud + accusative.

Here pueri is genitive singular, meaning of the boy or the boy’s.

It tells you whose bed it is:

• lectum pueri = the boy’s bed / the bed of the boy

This is a very common Latin pattern:

• noun + genitive noun
• lectum pueri = bed of the boy
• liber pueri = the boy’s book

So pueri is not the subject here. It is describing lectum.

Because pueri can have more than one meaning depending on context:

• nominative plural = boys
• genitive singular = of the boy

In this sentence, pueri is clearly genitive singular because it fits naturally with lectum:

• lectum pueri = the boy’s bed

If pueri were the subject boys, the sentence structure would not make sense in the same way.

Because mater is in the nominative singular, the case usually used for the subject.

Also, the verb vigilat is third person singular, so it matches a singular subject:

• mater = singular
• vigilat = she/he is awake, singular

So mater is the one doing the action.

Vigilat comes from vigilare, meaning:

• to stay awake
• to keep watch
• to be on watch

In this sentence, it suggests more than just not sleeping. It often gives the idea that the mother is watching over the child attentively.

So depending on the context, you might translate it as:

• is awake
• keeps watch
• is keeping watch

Latin usually has no articles.

So:

• mater can mean mother, a mother, or the mother
• lectum can mean bed, a bed, or the bed

The exact English wording depends on context.

That is why Mater apud lectum pueri vigilat can naturally be translated with the in English even though Latin does not say it explicitly.

Latin word order is more flexible because the endings show the grammatical roles.

English depends heavily on word order:

• The mother watches by the boy’s bed

Latin can move the words around more freely because:

• mater shows the subject
• lectum shows the object of the preposition apud
• pueri shows possession
• vigilat shows the action

So Mater apud lectum pueri vigilat is natural Latin, even though it does not match English word order exactly.

Yes. For example, Latin could also say:

• Apud lectum pueri mater vigilat
• Mater pueri apud lectum vigilat
• Vigilat mater apud lectum pueri

These all keep basically the same meaning: The mother keeps watch by the boy’s bed.

However, changing the order can slightly change the emphasis:

• putting mater early emphasizes the mother
• putting vigilat early emphasizes the action
• putting apud lectum pueri early emphasizes the place

Apud means at, by, or near, especially in the sense of being beside someone or something.

So:

• apud lectum = by the bed, at the bed

By contrast, ad often means to or toward, and can suggest movement or direction:

• ad lectum = to the bed

Since the mother is already there, apud is a good choice.

They are:

• mater, matris = mother
• apud = at, near, by
• lectus, lecti = bed
• puer, pueri = boy
• vigilo, vigilare, vigilavi, vigilatum = stay awake, keep watch

Knowing the dictionary forms helps you recognize why the sentence uses:

• mater as nominative singular
• lectum as accusative singular
• pueri as genitive singular
• vigilat as third person singular present active

By itself, mater just means mother. Latin often leaves relationship details unstated if they are obvious from context.

So in context, it could mean:

• the mother
• his mother
• the boy’s mother

The sentence does not explicitly say the boy’s mother with a genitive like mater pueri, but the context may strongly suggest it.

A simple classroom pronunciation would be:

• Mater = MAH-ter
• apud = AH-pood
• lectum = LEK-toom
• pueri = POO-eh-ree or PWER-ee, depending on pronunciation style
• vigilat = WIG-ee-laht in classical pronunciation, or VIJ-i-lat in some later styles

A rough full pronunciation in classical style: MAH-ter AH-pood LEK-toom POO-eh-ree WIG-ee-laht