La reflekto restas en la kadro.

In Esperanto, la is the definite article, meaning the. It does not change for gender, number, or case.

So:

• la reflekto = the reflection
• la kadro = the frame

Esperanto often uses la in the same places English uses the.

The ending -o marks a noun in Esperanto.

So reflekto is a noun meaning reflection.
You can often spot the part of speech from the ending:

• -o = noun
• -a = adjective
• -e = adverb
• -i = infinitive verb

That means reflekto is clearly a reflection or the reflection, depending on whether it has la.

Restas means remains or stays.

It comes from the verb resti = to remain / to stay.

The ending -as shows present tense, so:

• resti = to remain
• restas = remains / is remaining / stays

In this sentence, it tells you that the reflection continues to be in the frame.

In Esperanto, verb tense is very regular. The ending tells you the tense:

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

So restas is present tense: remains or stays.

Because this sentence describes location, not movement toward something.

• en la kadro = in the frame or inside the frame
• en la kadron would suggest movement into the frame

Esperanto often uses -n after a preposition when there is direction or motion toward a place. Here, the reflection is already there and remains there, so no -n is needed.

Kadro usually means frame.

Depending on context, it can be:

• a picture frame
• a border or framing structure
• sometimes a figurative framework

In this sentence, it most naturally means a literal frame.

Not completely. Esperanto word order is fairly flexible because the grammar endings do a lot of the work.

The neutral order here is:

• La reflekto restas en la kadro.

But other orders are possible for emphasis, such as:

• En la kadro restas la reflekto.

That said, the original order is the most straightforward and natural for a learner.

Yes. Both are reasonable translations.

• stays sounds a bit more everyday
• remains can sound slightly more formal or literary

Esperanto resti covers both ideas. The best English choice depends on the context.

Because resti is not a transitive verb here. It does not act on an object.

The structure is:

• subject: La reflekto
• verb: restas
• prepositional phrase: en la kadro

So the sentence means that the subject exists or continues in a certain place; it is not doing something to another noun.

A simple pronunciation guide is:

la reh-FLEK-to RES-tas en la KA-dro

A few helpful points:

• r is usually trilled or tapped
• e is like the vowel in met
• a is like the vowel in father
• stress in Esperanto is always on the second-to-last syllable

So:

• reflekto → re-FLEK-to
• restas → RES-tas
• kadro → KA-dro

It can depend on context, just as reflection in English can mean either:

• an image seen in a mirror or surface
• careful thought

But in this sentence, because of en la kadro = in the frame, the visual meaning is the natural one.