A equipe é capaz de terminar.

Because equipe is a feminine noun in Portuguese, so it takes the feminine article a.

• a equipe = the team
• uma equipe = a team

The gender here is grammatical, not about biological sex. Even if the team is made up of men, women, or both, the noun equipe is still feminine.

It uses é because this sentence talks about a quality or ability of the team, not a temporary condition.

• ser → used for identity, characteristics, general descriptions
• estar → used for states, conditions, locations

So:

• A equipe é capaz... = The team is capable...
• A equipe está cansada. = The team is tired.

Here, being capable is treated as a characteristic, so ser is the natural choice.

Capaz de means capable of, able to, or sometimes able enough to.

In this sentence:

• é capaz de terminar = is capable of finishing / is able to finish

It is a very common structure in Portuguese:

• Ela é capaz de resolver isso. = She is capable of solving that.
• Somos capazes de vencer. = We are capable of winning.

Because the expression is ser capaz de + infinitive.

So the structure is:

• é capaz de terminar
• sou capaz de fazer
• somos capazes de ajudar

That de is required by the expression. English learners often want to say something like é capaz terminar, but standard Portuguese needs de here.

It is in the infinitive because it comes after the expression ser capaz de.

Portuguese often uses this pattern:

• verb/expression + preposition + infinitive

Examples:

• gostar de estudar = to like studying
• precisar de ajuda = to need help
• ser capaz de terminar = to be capable of finishing

So terminar stays in its base form, meaning to finish.

Yes. A equipe pode terminar is also correct, but the meaning is a little different.

• A equipe é capaz de terminar = emphasizes ability/capacity
• A equipe pode terminar = can mean is able to finish, but also may finish depending on context

So pode is a bit broader and sometimes more ambiguous.
If you want to stress competence or capability, é capaz de is often clearer.

In this sentence, equipe is grammatically singular, so the verb is singular:

• A equipe é...

In Brazilian Portuguese, collective nouns like equipe, time, grupo, and turma are usually treated as singular when referring to the group as one unit.

Examples:

• A equipe está pronta.
• O grupo chegou cedo.

If you want to emphasize the individual members, Portuguese usually changes the wording rather than switching the verb to plural.

Not necessarily. Terminar can appear without an expressed object when the thing being finished is understood from context.

So:

• A equipe é capaz de terminar.
  can mean something like
• The team is capable of finishing.
• The team can finish.

Depending on context, the listener may understand the game, the project, the task, etc.

You could also make the object explicit:

• A equipe é capaz de terminar o projeto. = The team is capable of finishing the project.

A simple approximate pronunciation is:

• é ≈ eh
• capaz ≈ kah-PAHS or kah-PAHZ depending on accent

A rough full pronunciation of the sentence is:

• A equipe é capaz de terminar
• roughly: ah eh-KEE-pee eh kah-PAHS jeh tehr-mee-NAR

A few notes:

• equipe has stress on -qui-: e-QUI-pe
• é is an open vowel, like eh
• In many Brazilian accents, de before another consonant can sound like jee/dee or a softer dih
• terminar has stress on the last syllable: ter-mi-NAR

If you change a equipe to a plural subject, the adjective must also agree:

• singular: A equipe é capaz de terminar.
• plural: As equipes são capazes de terminar.

Notice the changes:

• a → as
• é → são
• capaz → capazes

That is because adjectives in Portuguese often agree in number with the noun.

In this sentence, capaz clearly means capable or able. But in Brazilian Portuguese, capaz can sometimes appear in other expressions too.

For example, depending on region and tone, it can be used in informal speech with meanings like surprise or disbelief. However, that is not what is happening here.

In A equipe é capaz de terminar, it is simply the adjective capaz = capable.