La cuesta es muy larga.

Because cuesta is a feminine singular noun, so it takes the feminine article la.

• la cuesta = the slope / the hill
• If a noun is feminine, adjectives describing it also usually need feminine forms.

That is why the sentence also has larga, not largo.

Because adjectives in Spanish usually agree with the noun they describe in gender and number.

Here:

• cuesta = feminine singular
• so the adjective must also be feminine singular
• largo becomes larga

Compare:

• el camino largo = the long path
• la cuesta larga = the long slope

Spanish uses ser and estar differently, and this is a very common learner question.

Here, es is used because larga describes a more inherent characteristic of the slope: its length. It is being presented as part of what the slope is like.

• La cuesta es muy larga. = The slope is very long.

Using está would sound unusual here, because length is not normally thought of as a temporary state.

Here, cuesta means something like:

• slope
• hill
• incline

The best English translation depends on context.

A useful thing to know is that cuesta can also mean cost in other contexts, because cuesta is also a form of the verb costar:

• La cuesta es muy larga. = The slope is very long.
• La camisa cuesta mucho. = The shirt costs a lot.

So context is very important.

It means long, not steep.

If you wanted to say steep, Spanish would more likely use:

• empinada

So:

• La cuesta es muy larga. = The slope is very long.
• La cuesta es muy empinada. = The slope is very steep.

In English, people sometimes mix up long hill and steep hill, but Spanish keeps those ideas separate.

Because muy means very, and in Spanish it normally goes before adjectives and adverbs.

So:

• muy larga = very long
• muy rápido = very fast
• muy bonita = very pretty

You would not normally put it after the adjective.

No, Cuesta es muy larga is not correct here.

You need la because cuesta is being used as a noun meaning the slope / the hill. In this sentence, it refers to a specific slope or hill, so the definite article is natural.

• La cuesta es muy larga. = The slope is very long.

Without the article, it would not work as a normal sentence.

A simple pronunciation guide is:

la KWEHS-ta es muy LAR-ga

A few details:

• cue in cuesta sounds like kwe
• es is a short es
• muy sounds like mui
• larga has a hard g sound, like in go
• The stress is on:
  • CUES-ta
  • LAR-ga

So the natural rhythm is:

la CUES-ta es muy LAR-ga

The standard, neutral word order is:

La cuesta es muy larga.

This is the most natural way to say it.

Spanish word order can sometimes change for emphasis, but beginners should stick to the normal pattern:

• article + noun + verb + adverb + adjective

So here:

• La = the
• cuesta = slope
• es = is
• muy = very
• larga = long

Normally, no.

Even though English uses is for both ser and estar, Spanish distinguishes them. For physical characteristics like long, short, big, and small, Spanish usually uses ser.

So the correct sentence is:

• La cuesta es muy larga.

Using estar with larga would sound unnatural in most ordinary contexts.

Not exactly. The subject is already stated: La cuesta.

English often needs a subject like it or the hill, but Spanish does not add an extra subject pronoun when the noun is already there.

So:

• La cuesta = the subject
• es = is
• muy larga = very long

You do not need anything like ella here.

Yes, sometimes, depending on context.

Cuesta often refers to an upward slope, an incline, or a hill section of a road or path. In everyday English, that may be translated as:

• hill
• slope
• incline

So if the meaning shown to the learner is The hill is very long, that can still be fine in context. Just remember that cuesta often emphasizes the sloping/uphill part, not a hill as a landform in the broadest sense.

No, muy is used with adjectives and adverbs, not directly with nouns.

So these are correct:

• muy larga = very long
• muy difícil = very difficult

But with nouns, Spanish usually uses mucho / mucha / muchos / muchas instead:

• mucha cuesta = a lot of slope / many hills, depending on context

In your sentence, muy is correct because it modifies the adjective larga.