Mi metas la pluvombrelon apud la pordo, ĉar ĝi estas malseka.

The -n marks the direct object.

In Mi metas la pluvombrelon apud la pordo, the thing being put is the umbrella, so pluvombrelo becomes pluvombrelon.

• Mi = I
• metas = put / am putting
• la pluvombrelon = the umbrella (direct object)

By contrast, la pordo does not take -n here, because it is part of the prepositional phrase apud la pordo = next to the door.

Metas is the present tense.

Esperanto verb endings are very regular:

• -as = present
• -is = past
• -os = future
• -us = conditional
• -u = command / wish

So:

• Mi metas = I put / I am putting
• Mi metis = I put / I was putting
• Mi metos = I will put

In Esperanto, the present tense often covers both simple present and present progressive English meanings.

It is a compound word:

• pluvo = rain
• ombrelo = a shade/parasol/umbrella-like covering

So pluvombrelo literally suggests something like rain-shade, which means umbrella.

This is very common in Esperanto: words are often built from smaller meaningful parts.

Apud means beside, next to, or by the side of.

So:

• apud la pordo = next to the door

This tells you the location where the umbrella is being placed.

A learner might compare it with:

• ĉe la pordo = at the door
• apud la pordo = beside the door

Apud is a bit more specific about being physically next to something.

Yes, Esperanto can use -n to show direction or movement toward a place, but that is not what is happening here.

Here, apud la pordo describes a location: the umbrella ends up next to the door.

• apud la pordo = next to the door
• apud la pordon would suggest motion toward a position by the door, but with apud, learners usually first meet the simpler location use.

In this sentence, the basic idea is just placement at a location, so apud la pordo is the natural form.

Ĉar means because.

It introduces a reason:

• Mi metas la pluvombrelon apud la pordo, ĉar ĝi estas malseka.
  = I put the umbrella next to the door, because it is wet.

So the second clause explains why the speaker is putting the umbrella there.

In normal context, ĝi refers to la pluvombrelo — the umbrella.

So the meaning is:

• I put the umbrella next to the door, because it is wet.

Grammatically, Esperanto ĝi can refer to a thing, since Esperanto does not divide inanimate nouns into he/she the way English does for people. But since both umbrella and door are things, a learner may notice that ĝi could seem ambiguous out of context.

In practice, common sense resolves it: umbrellas get wet much more naturally than doors in this sentence.

If a speaker wanted to be extra clear, they could repeat the noun instead of using ĝi.

Esperanto uses:

• li = he
• ŝi = she
• ĝi = it

Since an umbrella is a thing, not a person, Esperanto uses ĝi.

Unlike languages where every noun has grammatical gender, Esperanto generally does not assign masculine or feminine gender to ordinary objects. So pordo and pluvombrelo are simply things, and ĝi is the normal pronoun for them.

Because malseka is an adjective, and here it is describing the subject ĝi after estas.

• malseka = wet
• malseke = wetly

After esti (to be), Esperanto normally uses an adjective for this kind of description:

• ĝi estas malseka = it is wet

Using malseke would be adverbial and would not fit this sentence.

Yes, adjectives in Esperanto can agree with the noun or pronoun they describe in number and sometimes case.

Here, ĝi is singular, so the adjective is singular too:

• ĝi estas malseka = it is wet

If it were plural, you would get:

• ili estas malsekaj = they are wet

So here malseka is singular because ĝi is singular.

Esperanto word order is fairly flexible, but this sentence uses the most straightforward pattern:

• Mi = subject
• metas = verb
• la pluvombrelon = object
• apud la pordo = place
• ĉar ĝi estas malseka = reason clause

Because Esperanto marks the direct object with -n, you can sometimes move parts around more freely than in English. But for learners, this standard order is the clearest and most natural.

Because ĉar ĝi estas malseka is a separate clause giving the reason.

In Esperanto, it is very common to separate such clauses with a comma:

• ..., ĉar ĝi estas malseka.

This is similar to English punctuation in many cases, especially when a full reason clause follows the main statement.

Yes.

Esperanto -as does not make the same sharp distinction that English often makes between:

• I put
• I am putting

So Mi metas la pluvombrelon apud la pordo can work for either, depending on context.

If the situation is happening right now, English may prefer I am putting. Esperanto still simply uses metas.