Metu la ŝtopilon en la elektringon.

Metu is the -u form of the verb meti. The -u form is used for commands, requests, instructions, and similar ideas.

So:

• meti = to put
• metas = puts / is putting
• metu = put! / should put / let ... put

In this sentence, Metu ... means a command like Put ...

The subject is not stated, but it is usually understood as vi (you). So the full idea is:

• (Vi) metu la ŝtopilon en la elektringon.

That is normal in Esperanto. Commands often leave out vi, just as English often leaves out you in commands.

The -n shows the direct object of the verb.

Here, the verb is metu (put), and the thing being put is la ŝtopilon. So la ŝtopilon is the direct object, and it takes -n.

Compare:

• la ŝtopilo = the plug
• la ŝtopilon = the plug (as the direct object)

This is one of the most important uses of -n in Esperanto.

They have different reasons for having -n.

• la ŝtopilon gets -n because it is the direct object
• la elektringon gets -n because it shows movement toward/into a place

After a preposition like en, Esperanto can use:

• en + no -n for being in a place
• en + -n for going into a place

So:

• en la elektringo = in the socket / in the outlet
• en la elektringon = into the socket / into the outlet

That means the sentence has:

• one object -n
• one direction -n

So yes, both can appear in the same sentence.

In Esperanto, en can cover both in and into. The difference is often shown by whether the following noun has -n.

So:

• en la skatolo = in the box
• en la skatolon = into the box

This is very common in Esperanto. English often uses a different word (in vs into), but Esperanto often uses the same preposition and lets the -n show direction.

It is a compound word, which is extremely common in Esperanto.

elektringo is built from:

• elektr- = electric / electrical
• ingo = holder, socket, sheath, container something fits into
• -o = noun ending

So elektringo is literally something like electrical socket/holder.

A key point about Esperanto compounds is that roots are usually joined directly, and only the final grammatical ending appears at the end of the whole word.

So you do not normally say something like elektroingo. The root is elektr-, and then the noun ending comes at the very end:

• elektr + ing + o → elektringo

La is the definite article, meaning the.

So:

• la ŝtopilon = the plug
• la elektringon = the socket / the outlet

It is used because the sentence is talking about specific things, not just any plug or any socket.

Unlike English, Esperanto has:

• la = the
• no separate word for a/an

So if you remove la, the sentence would sound less definite and more context-dependent.

No, Esperanto word order is fairly flexible because endings show the grammatical roles.

The normal order here is:

• Metu la ŝtopilon en la elektringon.

But other orders are possible, especially for emphasis, for example:

• En la elektringon metu la ŝtopilon.

That still means the same basic thing because:

• ŝtopilon is clearly the object
• elektringon after en still shows direction

Even so, the original order is the most natural and straightforward for a learner.

Ŝ is pronounced like English sh.

So ŝtopilon begins roughly like shto-

A rough pronunciation guide:

• ŝtopilon ≈ sh-to-PEE-lon
• elektringon ≈ e-lek-TRIN-gon
• metu ≈ MEH-too

A few helpful pronunciation facts:

• Esperanto letters are pronounced consistently
• ŝ always sounds like sh
• stress is normally on the second-to-last syllable

So:

• ME-tu
• ŝto-PI-lon
• e-lek-TRIN-gon

Then you would use en without the directional -n.

For example:

• La ŝtopilo estas en la elektringo.

That means the plug is in the socket, not moving into it.

So the contrast is:

• Metu la ŝtopilon en la elektringon. = movement into
• La ŝtopilo estas en la elektringo. = location in

This is a very useful pattern to learn early, because Esperanto uses it with many prepositions and movement expressions.