Hodie unum carmen breve recitandum est.

Hodie means today, and it is an adverb, so it does not change its form.

Putting it first gives it a little emphasis, like As for today... or Today, ... in English. Latin word order is flexible, so hodie could appear elsewhere, but the beginning is a very natural place for a time word.

Recitandum est is the gerundive of obligation with est. This construction is often called the passive periphrastic.

It means something like:

• must be recited
• has to be recited
• is to be recited

So the sentence is not just saying that a recitation is happening; it expresses necessity or obligation.

Recitandum is the gerundive of recitare.

The gerundive is a verbal adjective, so it behaves like an adjective and must agree with the noun it goes with. Here it agrees with carmen, which is:

• neuter
• singular
• nominative

So the gerundive also becomes neuter nominative singular: recitandum.

Very roughly:

• masculine: recitandus
• feminine: recitanda
• neuter: recitandum

This is a very common point of confusion.

In English, we often think of recite as taking an object: Someone recites a poem. But in Latin, with recitandum est, the sentence is built passively: One short poem must be recited.

That means one short poem is the grammatical subject.

Here is the important clue:

• recitandum agrees with carmen
• therefore carmen must be nominative

The tricky part is that carmen is a neuter noun of the 3rd declension, and in neuter nouns the nominative and accusative singular are identical. So the form carmen could look like either one, but in this sentence it is nominative.

Because breve agrees with carmen.

Brevis, breve means short. It is a 3rd-declension adjective with these nominative singular forms:

• masculine/feminine: brevis
• neuter: breve

Since carmen is neuter, the adjective must also be neuter: breve.

Again, this is because it agrees with carmen.

Unus, una, unum means one. Its nominative singular forms are:

• masculine: unus
• feminine: una
• neuter: unum

Since carmen is neuter singular, the correct form is unum.

In this sentence, unum can mean simply one, or a bit more emphatically a single / only one.

Because the subject is singular: unum carmen breve.

The whole idea is One short poem must be recited, so Latin uses singular agreement:

• carmen = singular
• recitandum = singular
• est = singular

If the subject were plural, the whole construction would become plural, for example:

• Tria carmina brevia recitanda sunt.
• Three short poems must be recited.

The sentence leaves that unspecified.

Latin often uses this construction just to state that something must be done, without saying who must do it. If the person responsible needs to be stated, Latin often uses the dative of agent:

• mihi unum carmen breve recitandum est = I must recite one short poem
• literally, to me one short poem must be recited

So in your sentence, the focus is on the obligation itself, not on the person who has the obligation.

Yes. Latin word order is much freer than English word order.

For example, you could also see:

• Unum carmen breve hodie recitandum est.
• Unum hodie carmen breve recitandum est.

The basic meaning would stay the same. The reason is that the endings, not just the position, show how the words fit together.

In your sentence, putting hodie first nicely highlights the time.

The dictionary form is:

• carmen, carminis n.

That tells you:

• nominative singular: carmen
• genitive singular: carminis
• gender: neuter

It is a 3rd-declension neuter noun. Its basic meaning is song, poem, or verse, depending on context.

No. Latin has several ways to express obligation, but recitandum est is a very standard and elegant one.

Other possibilities include expressions with verbs like:

• oportet = it is proper / one ought
• debeo = I ought / I must

But recitandum est has a slightly different feel: it presents the action as something that needs to be done. It often sounds more formal or objective than a personal I must style.

Usually, yes. In a sentence like this, hodie straightforwardly means today.

In some contexts, words for time can be used more loosely, but for a learner, the safe understanding here is simply today. It is telling you when the obligation applies.