La experiencia demostrable acredita la competencia profesional.

Because Spanish normally uses the definite article with both nouns here:

• La experiencia demostrable = the subject
• la competencia profesional = the direct object

English often drops the in general statements, but Spanish uses articles more often, especially with abstract nouns like experiencia and competencia.

Experiencia is a feminine noun in Spanish, so it takes the feminine article la.

A few useful points:

• Many nouns ending in -a are feminine, and experiencia follows that pattern.
• You learn its gender as part of the noun: la experiencia.
• In this sentence, the adjective demostrable does not show gender clearly because it has the same singular form for masculine and feminine.

These two words are related but not identical:

• demostrable = demonstrable, provable, verifiable, something that can be shown or proved
• demostrada = demonstrated, shown, already proved

So experiencia demostrable usually means experience that can be backed up with evidence, references, documents, or a work history. In job and formal contexts, this is very common wording.

In Spanish, descriptive adjectives usually come after the noun.

So:

• experiencia demostrable is the normal order
• putting the adjective before the noun would sound marked, literary, or unnatural in this context

Also, after-the-noun position often helps define or restrict the noun: not just any experience, but experience that is verifiable.

Not exactly. Acreditar can sometimes mean to accredit, but in sentences like this it more often means:

• to prove
• to certify
• to attest to
• to establish as evidence of

So here acredita is closer to proves or shows as valid evidence of, not usually the institutional sense of to accredit a school or organisation.

Because the subject is singular: La experiencia demostrable.

The verb has to agree with its subject:

• La experiencia demostrable acredita... = singular subject, singular verb
• Las experiencias demostrables acreditan... = plural subject, plural verb

So acredita is the third-person singular present indicative form of acreditar.

The present tense is used here to express a general truth or general statement.

This sentence is not talking about one specific past event. It is stating a general principle: demonstrable experience serves as proof of professional competence.

That is very common in Spanish, just as in English.

Because Spanish often uses the definite article with abstract nouns, where English might not.

Here la competencia profesional refers to professional competence as a concept or quality. Using la sounds natural and standard.

Without the article, the phrase could sound more like a heading, label, or very compressed bureaucratic style, but in a full sentence, la competencia profesional is the normal choice.

No. Here competencia means competence, ability, or professional capability.

This is a good false-friend warning, because competencia can mean different things depending on context:

• competencia = competence, ability
• competencia = competition
• competencia = jurisdiction/authority in legal or administrative contexts

In this sentence, because it is modified by profesional, the meaning is clearly professional competence.

Some Spanish adjectives have the same singular form for masculine and feminine, and profesional is one of them.

So you get:

• competencia profesional
• capacidad profesional
• desarrollo profesional

The adjective only changes for number:

• singular: profesional
• plural: profesionales

Yes, but the original order is the most neutral and natural:

• La experiencia demostrable acredita la competencia profesional.

If you want to emphasize the object, you could say:

• La competencia profesional la acredita la experiencia demostrable.

That version is more marked and usually needs the object pronoun la. It sounds more emphatic or contrastive, not like the default order.

So for standard use, the original sentence is best.

Because the personal a is mainly used with specific human direct objects, and sometimes with personified animals.

Here the direct object is la competencia profesional, which is an abstract thing, not a person. So no a is used.

Compare:

• Veo a María. = I see María.
• Veo la competencia profesional. = I see professional competence.

In standard Peninsular Spanish, an approximate pronunciation is:

la eks-pe-rien-thya de-mos-tra-ble a-kre-di-ta la kom-pe-ten-thya პრო-fe-syo-nal

A few key Spain-specific points:

• c before e or i is usually pronounced like th in think
  • experiencia
  • competencia
• The stress falls on:
  • experiencia
  • demostrable
  • acredita
  • competencia
  • profesional

If you are learning Spanish from Spain, that th sound for c before e/i is one of the most noticeable pronunciation features.