Mi certe akvumos la planton hodiaŭ.

The -n marks the direct object.

In this sentence, the thing receiving the action of watering is the plant, so la planto becomes la planton.

• Mi akvumos la planto = incorrect here
• Mi akvumos la planton = correct

This -n ending is called the accusative ending in Esperanto.

Akvumos is the future tense form of the verb akvumi.

It breaks down like this:

• akvum- = the verb stem
• -os = future tense

So:

• akvumas = waters / is watering
• akvumis = watered
• akvumos = will water

Esperanto verb endings are very regular, so -os always means future.

Because today does not have to mean right now.

Mi certe akvumos la planton hodiaŭ means that the speaker plans to do it later today.

So there is no conflict between:

• hodiaŭ = today
• akvumos = will water

Together they mean something like I will definitely water the plant today.

Certe is an adverb, and here it means something like:

• certainly
• definitely
• for sure

It adds a sense of confidence or certainty to the whole statement.

So without it:

• Mi akvumos la planton hodiaŭ = I will water the plant today

With it:

• Mi certe akvumos la planton hodiaŭ = I will definitely/certainly water the plant today

La is the definite article, meaning the.

So la planton means the plant, referring to a specific plant that both speaker and listener can identify, or that is already known from context.

If you said just planton, that would sound more like a plant or some plant, depending on context.

Also notice that la itself does not change. The -n goes on the noun:

• la planto = the plant
• la planton = the plant, as a direct object

Yes, in normal Esperanto you do need Mi.

Esperanto verbs do not change for person:

• mi akvumos = I will water
• vi akvumos = you will water
• li akvumos = he will water

Because the verb form stays the same, the subject pronoun is usually necessary.

Yes. Akvo means water, and akvumi means to water something.

So the idea is basically to give water to.

This is a very useful word in everyday Esperanto. For plants, akvumi is the normal verb you would use.

Yes, Esperanto word order is fairly flexible.

The basic order here is:

• Mi = subject
• certe = adverb
• akvumos = verb
• la planton = object
• hodiaŭ = time expression

But other orders are also possible, for example:

• Hodiaŭ mi certe akvumos la planton.
• Mi akvumos la planton certe hodiaŭ.

Some versions may sound more natural than others depending on emphasis, but the meaning stays clear because planton has the -n marking it as the object.

The ŭ is a very short glide, similar to the w sound in English now or cow.

So hodiaŭ is pronounced approximately like:

• ho-di-aŭ

The last part, aŭ, sounds a bit like the ow in now.

A rough English-friendly approximation would be ho-dee-ow, though Esperanto pronunciation is more regular than English spelling.

No, not always.

Putting certe before the verb is very normal:

• Mi certe akvumos la planton hodiaŭ.

But Esperanto allows some movement of adverbs depending on emphasis. For example:

• Certe mi akvumos la planton hodiaŭ.
• Mi akvumos la planton hodiaŭ certe.

The first version is probably the most neutral and natural for many situations. The exact placement can slightly change what feels emphasized, but the core meaning stays the same.