Esta costura está torcida, pero mi tía dice que puede corregirla.

They are two different words:

• esta = this (feminine singular demonstrative)
• está = is (3rd person singular of estar)

So:

• Esta costura = This seam / this stitching
• está torcida = is twisted / crooked

The written accent in está helps distinguish it from esta.

Costura usually means seam, stitching, or sewing depending on context.

In this sentence, it most naturally refers to a seam or a line of stitching in fabric. So Esta costura está torcida means the seam or stitching is not straight.

Because torcida is agreeing with costura, which is a feminine singular noun.

In Spanish, adjectives usually match the noun in gender and number:

• costura → feminine singular
• so the adjective must be torcida

Compare:

• El cable está torcido = The cable is twisted
• La costura está torcida = The seam is twisted

Spanish often uses estar + past participle/adjective to describe a condition or resulting state.

Here, torcida describes the condition the seam is in: it has ended up crooked or twisted. So está torcida means it is in a twisted/crooked state.

Using ser here would sound wrong in normal Spanish, because the sentence is not talking about the seam’s essential nature, but about its current condition.

It can mean several similar things depending on context:

• twisted
• crooked
• not straight
• sometimes wonky in informal English

With costura, a very natural English translation is crooked or not straight, because we usually talk about seams being straight or crooked rather than literally twisted.

There actually is one: que.

• dice que... = says that...

In Spanish, que is normally used in this structure. English often allows that to be omitted, but Spanish usually keeps que.

So:

• mi tía dice que puede corregirla
• literally: my aunt says that she can correct it

Because decir que normally introduces a statement of fact or belief, so Spanish uses the indicative, not the subjunctive.

• Mi tía dice que puede corregirla = My aunt says she can correct it

You would use the subjunctive in different kinds of sentences, such as doubt, denial, emotion, or certain impersonal expressions. But dice que on its own usually takes the indicative.

The subject is omitted, but the most natural interpretation is mi tía.

So the meaning is:

• my aunt says that she can fix/correct it

Spanish often leaves out subject pronouns when the verb ending already makes the person clear enough from context.

Because la is a direct object pronoun attached to the infinitive corregir.

• corregir = to correct / fix
• la = it (referring to la costura)

So:

• corregirla = to correct it / to fix it

In Spanish, object pronouns can attach to:

• infinitives: corregirla
• gerunds: corrigiéndola
• affirmative commands: corrígela

But with conjugated verbs, the pronoun usually goes before the verb:

• la corrige

Because it refers to costura, which is a feminine noun.

Spanish direct object pronouns agree with the grammatical gender of the noun they replace:

• el libro → lo
• la costura → la

So:

• puede corregir la costura
• puede corregirla

Yes. Both are grammatical.

With a conjugated verb plus an infinitive, the object pronoun can often go in either place:

• puede corregirla
• la puede corregir

Both mean the same thing: she can correct it.

In many cases, attaching it to the infinitive sounds especially natural and common.

Here torcida is not directly modifying the noun inside the noun phrase. It is part of the predicate after estar.

Structure:

• Esta costura = subject
• está torcida = predicate

So this is not the same as saying una costura torcida (a crooked seam), where the adjective directly describes the noun. Instead, it says the seam is crooked.

Pero means but.

It connects two contrasting ideas:

• Esta costura está torcida = This seam is crooked
• pero mi tía dice que puede corregirla = but my aunt says she can fix it

So pero introduces the contrast between the problem and the possible solution.

Yes. Corregir literally means to correct, but in context it often translates naturally as to fix.

With something like a seam, English would often prefer:

• My aunt says she can fix it

Spanish uses corregir for putting something right, not just correcting language or mistakes on paper.

A broad guide would be something like:

• Esta → ES-ta
• costura → kos-TU-ra
• está → es-TA
• torcida → tor-THEE-da in most of Spain, because c before i is usually pronounced like th in thin
• pero → PE-ro
• mi tía → mi TEE-a
• dice → DEE-the in most of Spain
• que → keh
• puede → PWE-de
• corregirla → ko-rre-HEER-la or ko-rre-KHEER-la, depending on accent

The main Spain-specific feature a learner often notices is the c/z sound before e/i, which in much of Spain is pronounced like th in thin.