Avia carmen iucundum in horto cantat, et puella id libenter audit.

Because iucundum is describing carmen, and in Latin adjectives must agree with the nouns they describe in gender, number, and case.

• carmen is neuter
• it is singular
• here it is in the accusative case, because it is the direct object of cantat

So the adjective also has to be neuter singular accusative, which is iucundum.

Even though carmen does not end in -um, it is still neuter. Latin noun endings do not always work like adjective endings.

Because it is the direct object of cantat.

In Avia carmen iucundum in horto cantat, the grandmother is doing the singing, and the song is the thing being sung. That makes carmen the direct object.

So:

• avia = subject
• cantat = verb
• carmen iucundum = direct object

Because it follows in in the sense of location: in the garden.

With in, Latin usually works like this:

• in + ablative = in/on a place, showing location
• in + accusative = into/onto a place, showing motion toward

Here no one is moving into the garden; the action is happening there. So Latin uses in horto.

Avia is in the nominative singular, which is the normal case for the subject of a sentence.

We know it is the subject because:

• its form is nominative
• the verb cantat is third person singular, so it matches a singular subject
• the meaning fits: the grandmother sings

So avia is the doer of the action.

Id means it, and it refers back to carmen iucundum.

Instead of repeating carmen again, Latin uses the pronoun id:

• puella id libenter audit = the girl gladly listens to it

This is very common in Latin, just as English often says it instead of repeating the song.

Because id agrees with carmen, and carmen is neuter.

The forms are:

• eum = masculine accusative singular
• eam = feminine accusative singular
• id = neuter accusative singular

Since carmen is a neuter noun, the pronoun referring to it must also be neuter: id.

Libenter is an adverb. It means gladly, willingly, or with pleasure.

It modifies the verb audit, telling us how the girl listens.

So:

• puella audit = the girl listens
• puella libenter audit = the girl listens gladly

A native English speaker may expect an adjective, but Latin uses an adverb here because it describes the action, not the girl herself.

Both verbs are third person singular present active indicative.

That means:

• third person = he/she/it
• singular = one person
• present = happening now
• active = the subject performs the action
• indicative = a normal statement

So:

• cantat = she sings / is singing
• audit = she hears / listens to

The subjects are understood from the noun forms and context:

• avia ... cantat
• puella ... audit

Latin word order is more flexible than English word order because Latin uses case endings to show the grammatical role of many words.

So the sentence does not have to stay in exactly this order for the meaning to remain clear.

For example, Latin could also say things like:

• Avia in horto carmen iucundum cantat
• Puella id audit libenter

The endings still show what each word is doing.

That said, word order still matters for style, emphasis, and rhythm. The given order is natural and clear:

• avia comes first as the topic
• carmen iucundum stays together
• in horto gives the setting
• libenter is placed near audit, which it modifies

Classical Latin does not normally use articles like English the or a/an.

So avia can mean:

• grandmother
• a grandmother
• the grandmother

The exact meaning depends on context.

The same is true for puella, carmen, and horto. English has to choose an article when translating, but Latin usually does not state one.

Because puella is nominative singular, which marks it as the subject, and audit is third person singular, which matches it.

Also, id is accusative, so it is the direct object of audit.

So in the second clause:

• puella = subject
• id = object
• libenter = adverb
• audit = verb

That gives the structure: The girl gladly listens to it.

Literally, audit comes from audio, which often means hear. But in context it can also be translated more naturally as listen to, especially when the object is something like a song.

So here both ideas are close:

• the girl hears it
• the girl listens to it

If the meaning shown to the learner is listens to it, that is a natural English rendering in this context.

Et simply means and, joining the two clauses into one sentence:

• Avia carmen iucundum in horto cantat
• et puella id libenter audit

Latin often links related actions this way, just as English does.

It shows that the two actions belong together:

• the grandmother sings
• and the girl listens gladly

So et connects the two parts smoothly.