O relatório ainda não está pronto.

O is the masculine singular definite article, meaning the.

• o relatório = the report
• um relatório = a report

In Portuguese, articles are used more often than in English, so o relatório sounds very natural here.

Ainda não usually means not yet or still not, depending on how you translate it into natural English.

In this sentence:

• O relatório ainda não está pronto.
• literally: The report still not is ready
• natural English: The report isn’t ready yet.

So ainda não expresses that something has not happened up to this point, but it may happen later.

Portuguese has two main verbs for to be: ser and estar.

Here, estar is used because being ready is seen as a temporary state, not a permanent characteristic.

• está pronto = is ready
• é would sound wrong here in normal usage

A good rule:

• ser = identity, essence, permanent traits
• estar = condition, state, location

So o relatório ainda não está pronto is correct because readiness is a state.

Because pronto agrees with relatório, which is a masculine singular noun.

Agreement in Portuguese is very important:

• o relatório ... está pronto
• a tarefa ... está pronta

If the noun changes, the adjective usually changes too:

• o relatório → pronto
• a apresentação → pronta
• os relatórios → prontos
• as tarefas → prontas

Yes. That is also correct.

Both are natural:

• O relatório ainda não está pronto.
• O relatório não está pronto ainda.

The version with ainda não is often a little more standard or neutral in tone.
The version with ainda at the end is also very common in speech.

No, they are different.

• ainda não = not yet / still not
• já não = no longer / not anymore

Compare:

• O relatório ainda não está pronto.
  = The report isn’t ready yet.

• O relatório já não está pronto.
  = The report is no longer ready.

That second sentence is much less likely in normal context, but grammatically it shows the difference clearly.

In Portuguese, não usually comes before the verb it negates.

So:

• não está = is not

This is the normal pattern:

• não sei = I don’t know
• não quero = I don’t want
• não está pronto = it isn’t ready

English uses do/does/is/are + not, but Portuguese simply places não before the verb.

Yes, they matter both for pronunciation and correct spelling.

• relatório: the accent shows the stress falls on tó
• não: the tilde marks a nasal sound
• está: the accent shows stress on the last syllable

If you leave accents out, people may still understand you in informal typing, but it is considered incorrect in proper writing.

Usually no, not in a normal complete sentence.

The natural form is:

• O relatório ainda não está pronto.

Dropping the article can sound unnatural unless you are using a headline style, note-taking style, or some very specific context.

Portuguese often requires an article where English may not emphasize one as much.

It can mean all of those depending on context.

With a report, pronto often means:

• ready
• finished
• completed

So this sentence could imply:

• the report is not ready to send
• the report is not finished yet
• the report is not completed yet

The exact nuance depends on the situation.

The verb and adjective must agree with the subject.

Examples:

• A tarefa ainda não está pronta.
  = The task isn’t ready yet.

• Os relatórios ainda não estão prontos.
  = The reports aren’t ready yet.

• As apresentações ainda não estão prontas.
  = The presentations aren’t ready yet.

Notice the changes:

• o / a / os / as
• está / estão
• pronto / pronta / prontos / prontas

A simple approximate pronunciation is:

oo heh-lah-TOH-ryoo ah-EEN-dah now es-TAH PRON-too

A few notes:

• relatório has stress on tó
• ainda is usually pronounced with three syllables: a-in-da
• não has a nasal sound, not exactly like English now
• está has stress on the last syllable
• pronto has a nasal-ish on sound in Brazilian Portuguese

This is only an approximation, but it can help you get started.

The structure is:

article + noun + time expression + negation + verb + adjective

Broken down:

• O = the
• relatório = report
• ainda não = not yet / still not
• está = is
• pronto = ready

So the pattern is:

O relatório + ainda não + está + pronto

This is a very common Portuguese structure for saying something is not ready yet.