Omnis homo mortalis est.

Not necessarily. In Latin, omnis + singular noun often means every:

• omnis homo = every human being / each person

That is a very normal way to express a general truth. English often prefers either:

• Every person is mortal
• All people are mortal

Latin can also use the plural for all:

• omnes homines mortales sunt = all humans are mortal

So omnis homo mortalis est is grammatically singular, but it expresses a universal statement.

Here homo means human being or person, not specifically an adult male.

That is an important distinction:

• homo = human being, person
• vir = man in the sense of an adult male

So in this sentence, homo is being used in the broad, general sense: a human being.

The main words are in the nominative singular:

• omnis — nominative singular
• homo — nominative singular
• mortalis — nominative singular
• est — verb, not a noun/adjective case form

Why nominative?

• homo is the subject: the human being
• mortalis is a predicate adjective after est, so it also stands in the nominative
• omnis agrees with homo

So the structure is basically:

• omnis homo = subject
• mortalis = predicate adjective
• est = is

Because mortalis belongs to a different adjective pattern from adjectives like bonus, bona, bonum.

Latin adjectives are not all formed the same way. Mortalis is a third-declension adjective, and its nominative singular masculine/feminine form is mortalis.

So here:

• mortalis = mortal

It matches homo in:

• gender: masculine
• number: singular
• case: nominative

The important point is that agreement does not always mean using the ending -us. Different adjectives have different declension patterns.

Because Latin word order is much more flexible than English word order.

In English, we normally need:

• Every human being is mortal

But in Latin, the verb often comes later, especially in simple statements. So:

• Omnis homo mortalis est

is perfectly normal.

Latin uses endings, not fixed word position, to show grammatical relationships. That means the sentence could be rearranged without changing the basic meaning, though some word orders sound more natural or emphatic than others.

Sometimes Latin can omit a form of to be, especially in certain styles or contexts. But in a straightforward sentence like this, est is completely normal and expected.

So:

• Omnis homo mortalis est = standard full sentence

You may sometimes see omission of est in poetry, compressed style, or special contexts, but a learner should treat est as the normal form here.

Because Classical Latin has no articles.

Unlike English, Latin does not normally use words corresponding directly to:

• the
• a/an

So homo can mean, depending on context:

• a human being
• the human being
• humanity in a general sense

Here the context and the adjective omnis make the meaning clear: it is a general statement about human beings.

Omnis is an adjective modifying homo.

They agree in:

• case: nominative
• number: singular
• gender: masculine

So:

• omnis homo = every human being

This is a standard Latin adjective + noun combination. Even though omnis comes before the noun here, Latin can sometimes vary adjective position more freely than English.

It is nominative because it is a predicate adjective after the verb est.

In English, we say:

• The sky is blue
• The man is mortal

In Latin, after esse (to be), a predicate noun or predicate adjective normally matches the subject in the nominative.

So:

• homo = nominative subject
• mortalis = nominative predicate adjective

That is why mortalis is not accusative or any other case here.

Est is the:

• third person singular
• present tense
• of the verb esse = to be

So est means:

• is

It is singular because the subject, omnis homo, is singular.

A natural plural version would be:

• Omnes homines mortales sunt.

Word by word:

• omnes = all
• homines = humans / people
• mortales = mortal
• sunt = are

This shows the same idea, but now everything is plural:

• omnes instead of omnis
• homines instead of homo
• mortales instead of mortalis
• sunt instead of est

A simple classroom-style pronunciation would be roughly:

• OM-nis HO-mo mor-TA-lis est

A few notes:

• h in Latin is usually light
• c and g are always hard in Classical Latin, though there is no c or g here
• vowel length can matter in careful pronunciation, but beginners are often first taught the basic sound pattern

In Classical pronunciation, homo sounds roughly like HO-mo, and mortalis like mor-TA-lis.