Mentum sub ore est.

Because mentum is in the nominative singular, which is the case normally used for the subject.

In Mentum sub ore est:

• mentum = the chin and is the subject
• est = is
• sub ore = under the mouth

So the basic structure is:

• Mentum = subject
• est = verb
• sub ore = prepositional phrase

Also, mentum is a neuter noun, so its nominative singular form is mentum.

Because ore is the ablative singular of os, oris, meaning mouth.

The preposition sub can take different cases:

• ablative when it means under/beneath in a static location
• accusative when it means movement to a position under something

Here there is no motion. The sentence describes location: the chin is under the mouth. So Latin uses:

• sub + ablative → sub ore

The dictionary form is os, oris.

That noun means mouth. Its ablative singular is ore.

A learner may notice that os looks short and irregular compared with ore, but this is normal for third-declension nouns:

• nominative singular: os
• genitive singular: oris
• ablative singular: ore

So ore comes from os, oris, not from a separate word.

Classical Latin has no definite article and no indefinite article. So Latin often just uses the noun by itself where English would say the chin or a chin.

That means:

• mentum can mean chin, a chin, or the chin
• ore can mean mouth, a mouth, or the mouth, depending on context

In this sentence, English naturally uses the: The chin is under the mouth. But Latin does not need a separate word for that.

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

Placing est at the end is very normal Latin style, especially in simple statements. So:

• Mentum sub ore est
• Sub ore mentum est
• Mentum est sub ore

can all mean essentially the same thing.

The version with est at the end often sounds especially natural in basic Latin prose.

Yes, often they could.

Because Latin marks grammar with endings, word order is used more for emphasis and style than for basic meaning.

For example:

• Mentum sub ore est = neutral statement
• Sub ore mentum est = may emphasize under the mouth
• Mentum est sub ore = also possible, with slightly different rhythm

However, not every order is equally common or natural in every context. The given sentence is a straightforward, standard order for a beginner text.

Here sub means under or beneath.

It introduces a prepositional phrase telling you the position of the chin relative to the mouth.

So:

• sub = under, beneath
• sub ore = under the mouth

Since the idea is location, not motion, the phrase uses the ablative.

In ordinary prose, yes, you would normally include est.

Latin can sometimes omit forms of to be, especially in poetry, short labels, or very compressed expressions. But for a full, clear beginner sentence, est is normally stated.

So:

• Mentum sub ore est = complete standard sentence
• Mentum sub ore might be understood in some contexts, but it is less explicit

For a learner, it is best to read this as a normal sentence with the verb clearly expressed.

Yes. Mentum is the standard Latin noun for chin.

It is a second-declension neuter noun. Its basic forms are:

• nominative singular: mentum
• genitive singular: menti

In this sentence, it appears in the nominative singular because it is the subject.

There are two clues:

1. The verb

   • est means is, which describes a state or location, not motion.

2. The case after sub

   • ore is ablative
   • with sub, the ablative usually indicates location

If the sentence involved movement to a place under something, Latin would typically use sub with the accusative instead. Here, everything points to simple position: the chin is located beneath the mouth.