Mi prima tampoco soporta esa voz cuando el doblaje no parece natural.

Spanish has two main sets of possessives:

• Short forms before the noun: mi, tu, su, nuestro...
• Long forms after the noun or used for emphasis: mío/mía, tuyo/tuya, suyo/suya...

So before a noun, you say:

• mi prima
• tu coche
• su voz

Not mía prima.

You would use mía in a structure like:

• La prima es mía
• Esa voz no es mía

Tampoco means neither, not either, or also not, depending on context.

It is used in negative contexts. In this sentence, it shows that your cousin also shares a negative opinion.

Common patterns:

• Yo tampoco = me neither
• No me gusta, y a ella tampoco = I don’t like it, and neither does she
• Mi prima tampoco soporta... = my cousin doesn’t/can’t stand ... either

A useful contrast:

• también = also, too
• tampoco = not either, neither

Because the normal word order is:

subject + adverb + verb

So:

• Mi prima tampoco soporta...

is very natural.

You will often see tampoco before the main verb, but after the subject:

• Yo tampoco quiero ir
• Ella tampoco lo entiende

You can move things around for emphasis in Spanish, but the sentence as written is the most straightforward neutral order.

Soporta is the third person singular present tense of soportar, because the subject is mi prima.

Conjugation in the present:

• yo soporto
• tú soportas
• él/ella soporta
• nosotros soportamos
• vosotros soportáis
• ellos/ellas soportan

So mi prima soporta = my cousin tolerates / puts up with / can’t stand, depending on context.

Not usually in this kind of sentence.

Although soportar can sometimes relate to bearing or enduring something, in everyday Spanish it often means:

• to tolerate
• to put up with
• to stand

So here it means that she cannot tolerate that voice.

This is a good example of a false friend:

• English support
• Spanish soportar

For to support in the sense of helping or backing someone, Spanish often uses apoyar.

Because esa is already acting as the determiner.

In Spanish, you normally use:

• esa voz = that voice
• la voz = the voice

But not usually both together in standard modern Spanish.

Also, esa agrees with voz, which is feminine singular.

Demonstratives:

• esta voz = this voice
• esa voz = that voice
• aquella voz = that voice over there / that more distant voice

Yes, voz is feminine: la voz.

Spanish nouns do not always follow the -o masculine / -a feminine pattern. Many feminine nouns end in other letters:

• la voz
• la flor
• la mujer
• la nariz

You can tell voz is feminine because words around it agree with it:

• esa voz
• la voz
• una voz

Doblaje means dubbing: replacing the original spoken dialogue in a film or show with voices in another language.

In Spain, this is a very common word because many foreign films and series are dubbed.

Grammar-wise:

• el doblaje is masculine singular
• plural: los doblajes

So:

• el doblaje parece natural
• el doblaje no parece natural

Parecer means to seem or to appear.

So no parece natural means it does not give the impression of being natural.

That is slightly different from no es natural, which sounds more definite and direct.

Compare:

• No parece natural = it doesn’t seem natural
• No es natural = it isn’t natural

In this sentence, parecer works well because the speaker is judging how the dubbing comes across.

Some Spanish adjectives change form for gender:

• bonito / bonita
• natural does not

So natural has the same form for masculine and feminine singular:

• el doblaje natural
• la voz natural

And the plural is:

• naturales

So here natural matches doblaje, but its form stays natural because that adjective does not have separate masculine and feminine singular endings.

Because this sentence talks about a general or habitual situation.

When cuando means whenever/when in a general sense, Spanish normally uses the indicative:

• cuando el doblaje no parece natural

That means something like whenever the dubbing doesn’t seem natural.

If you were talking about a future event, Spanish often uses the subjunctive after cuando:

• cuando el doblaje no parezca natural...

That would suggest a future or not-yet-real situation.

So:

• cuando ... parece = general/habitual
• cuando ... parezca = future or hypothetical

Yes, but it would change the nuance a little.

• parece natural = seems natural
• suena natural = sounds natural

Since the sentence mentions voz and doblaje, suena natural would also make sense, especially if you are focusing on how it sounds.

But parece natural is broader: it can refer to the overall impression, not only the sound.

Because the personal a is normally used before a specific person or sometimes a personified being, not before things.

So:

• Veo a mi prima = I see my cousin
• Escucho esa voz = I hear that voice

Since esa voz is a thing, not a person, there is no personal a.

Most naturally, it sounds like a general truth or repeated reaction, not just one single moment.

Spanish present tense often covers:

• what happens now
• what usually happens
• general facts

So here it suggests something like:

• whenever the dubbing doesn’t seem natural, your cousin also can’t stand that voice

That is why the sentence feels habitual rather than limited to one exact moment.

In standard Spain Spanish, a learner might notice especially these sounds:

• voz: the z is pronounced like th in think
• parece: the c before e is also pronounced like th
• doblaje: the j is a strong throaty sound

So roughly:

• voz ≈ both
• parece ≈ parethe
• doblaje has a clear Spanish j

In much of Latin America, z and soft c are pronounced like s instead.