Avia sedens in sella fabulam narrat.

Avia means grandmother.

It is in the nominative singular because it is the subject of the sentence — the person doing the action. In Avia sedens in sella fabulam narrat, the grandmother is the one telling the story.

A native English speaker may expect word order alone to show the subject, but in Latin the ending is often more important than the position.

Sedens is a present active participle from sedere, meaning sitting.

So avia sedens means the grandmother, sitting or more naturally the grandmother sitting.

This participle describes avia, so it agrees with it in gender, number, and case:

• avia = feminine singular nominative
• sedens = nominative singular, matching avia

Latin often uses a participle where English might use:

• who is sitting
• while sitting
• sitting

So this phrase could be understood as:

• The grandmother, sitting on a chair, tells a story
• The grandmother who is sitting on a chair tells a story

Sedet is a finite verb meaning she sits or she is sitting.

Sedens is a participle, meaning sitting.

So the difference is:

• Avia in sella sedet. = The grandmother is sitting on a chair.
• Avia sedens in sella fabulam narrat. = The grandmother, sitting on a chair, tells a story.

In your sentence, narrat is the main verb, and sedens gives extra information about the grandmother.

Because here in means in/on in the sense of location, not motion.

Latin uses:

• in + ablative for location: in the chair / on the chair
• in + accusative for motion into/onto: into the chair / onto the chair

So:

• in sella = on/in the chair (where she is)
• in sellam = into/onto the chair (movement toward it)

Since the grandmother is already sitting there, Latin uses the ablative: sella.

Because sella is a first-declension noun, and its ablative singular ending is also -a.

That means sella can look similar to the nominative form, but its job in the sentence is different because it comes after in, which here takes the ablative.

So:

• sella can be nominative singular in some contexts
• but in in sella, it is ablative singular

This is a very common thing in Latin: the same spelling can sometimes represent different cases, and you tell which one it is from the grammar of the sentence.

Fabulam means story and is the direct object of narrat.

It is in the accusative singular because it receives the action of the verb:

• the grandmother tells what?
• a story

The base form is fabula (story), but as a direct object it becomes fabulam.

This is a key difference from English: Latin often marks the object with an ending instead of relying mainly on word order.

Narrat is:

• third person singular
• present tense
• active voice
• indicative mood

It comes from narrare, meaning to tell or to relate.

So narrat means:

• she tells
• she is telling

Since the subject is avia, we understand narrat as the grandmother tells.

Latin normally has no articles.

So a noun like avia can mean:

• grandmother
• a grandmother
• the grandmother

Likewise, fabulam can mean:

• a story
• the story

You decide from the context which English article sounds best. That is why one Latin sentence can be translated in slightly different ways.

Yes, the words could be rearranged, because Latin uses case endings more than English does.

For example, these would mean essentially the same thing:

• Avia sedens in sella fabulam narrat.
• Avia fabulam narrat sedens in sella.
• Fabulam avia sedens in sella narrat.

The endings still show:

• avia = subject
• fabulam = object
• in sella = location

However, word order in Latin is still meaningful for emphasis and style. The given order is natural and easy to understand.

It can mean either, depending on the natural English phrasing.

Latin in sella simply gives the location. In English, with a chair, we usually say on the chair or more naturally sitting in a chair depending on context.

So the Latin itself is straightforward, but the best English wording may vary a little.

Because sedens is in the nominative singular, which matches avia, not fabulam.

• avia = nominative singular
• fabulam = accusative singular

A participle agrees with the noun it describes in case, number, and gender. Since sedens matches the subject, it describes the grandmother.

So the sentence means the grandmother is sitting, not the story.

Yes.

That is a very natural way to understand the participle sedens. Latin often uses a participle where English might use a relative clause.

So these English translations are all reasonable:

• The grandmother sitting on a chair tells a story.
• The grandmother, sitting on a chair, tells a story.
• The grandmother who is sitting on a chair tells a story.

The exact English phrasing depends on style, but the Latin grammar supports all of them.

Here are the basic dictionary forms:

• avia → avia, aviae = grandmother
• sedens → from sedeo, sedere = sit
• in = in, on; into, onto depending on the case used
• sella → sella, sellae = chair, seat
• fabulam → fabula, fabulae = story, tale
• narrat → from narro, narrare = tell, relate

Looking up dictionary forms is useful because many Latin words appear in changed forms inside sentences.