En februaro mia fratino ofte restas hejme vespere kaj legas, ĉar la noktoj estas longaj.

En februaro means in February.

In Esperanto, en is often used with months, seasons, and other time expressions:

• en januaro = in January
• en somero = in summer
• en la mateno = in the morning

So En februaro mia fratino... means In February, my sister...

You may also sometimes see other time expressions without en, but en februaro is a very normal and straightforward way to say it.

In Esperanto, possessive words like mia, via, lia, ŝia, nia, ilia usually take the place of la.

So you say:

• mia fratino = my sister
• lia domo = his house
• nia urbo = our town

Not:

• la mia fratino in normal usage

So mia fratino is exactly what you would expect here.

Ofte means often.

It is an adverb, so it modifies the verb phrase. In this sentence:

• mia fratino ofte restas hejme = my sister often stays at home

Putting ofte before the verb is very common and natural in Esperanto.

Esperanto word order is fairly flexible, so you might also see:

• Mia fratino restas ofte hejme...

But ofte restas is probably the most neutral placement here.

Both can be translated naturally in some contexts, but they are not exactly the same.

• estas hejme = is at home
• restas hejme = stays/remains at home

Resti emphasizes remaining somewhere or staying there rather than going out.

So in this sentence, ofte restas hejme vespere suggests that in February, she often stays home in the evening.

That fits well with the reason given later: ĉar la noktoj estas longaj.

The -e ending marks an adverb.

Here both words are being used adverbially:

• hejme = at home
• vespere = in the evening / evenings

They describe the circumstances of the action:

• restas hejme = stays at home
• vespere = in the evening

This is very common in Esperanto. Compare:

• tage = by day / in the daytime
• nokte = at night
• matene = in the morning
• vespere = in the evening

So vespere is not an adjective here; it is a time adverb.

Yes. Esperanto allows fairly flexible word order, especially with adverbs.

For example, these are all understandable:

• En februaro mia fratino ofte restas hejme vespere kaj legas...
• En februaro mia fratino vespere ofte restas hejme kaj legas...
• Vespere, en februaro, mia fratino ofte restas hejme kaj legas...

The original version sounds natural and clear. Putting vespere after hejme works fine because both are adverbial details connected with restas and legas.

Because Esperanto, like English, can leave out the object when it is not important or is understood generally.

So:

• legas = reads / is reading

In this sentence, the point is simply that she stays home and reads; it is not necessary to say what she reads.

If you wanted to add an object, you could say:

• legas libron = reads a book
• legas romanojn = reads novels
• legas multe = reads a lot

Ĉar means because.

It introduces a reason:

• ...ĉar la noktoj estas longaj. = ...because the nights are long.

This is a very common conjunction in Esperanto. It connects the main statement with its explanation.

Examples:

• Mi restas hejme, ĉar pluvas. = I stay home because it is raining.
• Ŝi lernas, ĉar ŝi volas sukcesi. = She studies because she wants to succeed.

La is the definite article, meaning the.

Here la noktoj means the nights—that is, the nights in that situation, especially in February.

Esperanto often uses la in general statements when a specific set is understood from context. Since the sentence has already mentioned En februaro, la noktoj naturally means the nights in February.

So:

• la noktoj estas longaj = the nights are long

Without la, the sentence would sound different and less natural here.

Because adjectives in Esperanto must agree with the nouns they describe.

• nokto = night
• noktoj = nights

Since noktoj is plural, the adjective must also be plural:

• longa nokto = a long night
• longaj noktoj = long nights

In the sentence:

• la noktoj estas longaj

both noktoj and longaj are plural.

The ending -as is the present tense in Esperanto.

Here we have:

• restas = stays / remains
• legas = reads
• estas = are

The present tense is also used for habitual actions, just like in English:

• Mia fratino ofte restas hejme = My sister often stays at home

So this sentence is not necessarily describing one specific evening. It describes a usual pattern in February.

Yes.

In mia fratino ofte restas hejme vespere kaj legas, the subject mia fratino applies to both verbs:

• she stays home
• she reads

Esperanto often does this, just like English:

• My sister stays home and reads

There is no need to repeat mia fratino before legas unless you want special emphasis.

Yes, that is a very natural translation.

A few small shades of meaning are worth noticing:

• restas hejme specifically suggests stays at home
• vespere is in the evening
• la noktoj estas longaj gives the reason: the nights are long

So the overall idea is that during February, she often spends her evenings at home reading because the nights are long.