Bigae duos equos habent.

The subject is bigae, and the direct object is duos equos.

Why?

• habent means they have
• the thing doing the having is the subject, so bigae is the subject
• the thing being had is the direct object, so duos equos is the object

The endings help too:

• bigae is nominative plural here
• duos equos is accusative plural

So the sentence structure is basically:

bigae = subject
duos equos = object
habent = verb

Grammatically, bigae is plural in this sentence.

For a beginner, the simplest explanation is: it is a plural subject, so Latin treats it as plural.

There is also a vocabulary point worth knowing: bigae is often used in Latin as a plural-form noun for a two-horse chariot/team. So sometimes English may package the idea differently from Latin. But whatever meaning your textbook gives, Latin still treats bigae as grammatically plural here.

That is why the verb is plural too.

Because the subject is grammatically plural.

• habet = he/she/it has
• habent = they have

Since bigae is plural, the verb has to agree with it, so Latin uses habent.

This is called subject-verb agreement.

Because duos equos is the direct object of habent, and direct objects go in the accusative case.

So:

• equi would be nominative plural
• equos is accusative plural

Since the horses are what is being had, Latin needs the accusative: equos.

The numeral has to match the noun, so:

• duos matches equos
• both are masculine accusative plural

So duo equi would look like a subject, not an object.

Because equus is a masculine noun, and duo changes form to agree with the noun it describes.

Here the noun is:

• masculine
• accusative
• plural

So the correct form is duos.

Compare:

• masculine accusative plural: duos
• feminine accusative plural: duas
• neuter nominative/accusative plural: duo

So duos equos means two horses in the form required by the sentence.

Because Latin does not have articles like English does.

So Latin often leaves English speakers to supply a, an, the, or no article at all based on context.

That means bigae duos equos habent could be translated into natural English in different ways depending on context, even though the Latin itself has no separate word for the or a.

Not as much as in English.

Latin relies heavily on endings, so the word order is more flexible. The endings already tell you what each word is doing.

This sentence uses a very common order:

subject + object + verb

But Latin could also say things like:

• Duos equos bigae habent
• Habent bigae duos equos

Those versions still mean basically the same thing, though the emphasis may shift a little.

So in Latin, word order often affects focus or style more than basic grammar.

Because -ae can indeed mean several things in the first declension:

• nominative plural
• genitive singular
• dative singular

So you have to use context.

Here, habent needs a subject, and bigae fits perfectly as a nominative plural subject. A genitive singular or dative singular would not make sense with this verb in this sentence.

So even though the ending -ae is ambiguous by itself, the whole sentence makes the function clear.

Because Latin verbs already include the subject in their endings.

The ending -nt in habent already tells you:

• third person
• plural
• present tense

So habent by itself already means they have.

Latin can add a separate pronoun for emphasis, but it usually does not need one. That is why the sentence can simply say bigae duos equos habent without an extra word for they.