Ŝi estus pardoninta min, se mi tuj estus dirinta, ke la kulpo estis mia.

Estus pardoninta means would have forgiven.

It is a compound form made from:

• estus = the conditional form of esti (would be)
• pardoninta = the active past participle of pardoni (having forgiven)

Together, they express an unreal completed action in the past: something that did not actually happen, but would have happened under different circumstances.

So:

• Ŝi pardonus min = She would forgive me
• Ŝi estus pardoninta min = She would have forgiven me

Esperanto often uses these compound forms when it wants to be very precise about time.

The ending -int- is the active past participle. It shows that the action was already completed before the reference point.

So:

• dirinta = having said
• pardoninta = having forgiven

With estus, this gives the idea of would have done:

• estus dirinta = would have said
• estus pardoninta = would have forgiven

A quick comparison:

• -ant- = action in progress
• -int- = action completed
• -ont- = action about to happen

So -int- is the right choice here because both actions are viewed as completed in an unreal past situation.

Because the subject, ŝi, is the one doing the forgiving.

• pardoninta = having forgiven → active
• pardonita = having been forgiven → passive

Here the meaning is:

• She would have forgiven me

So the active participle is needed.

If you said Ŝi estus pardonita, that would mean:

• She would have been forgiven

That is a completely different meaning.

Because Esperanto can use the conditional in both clauses of an unreal condition.

So:

• Ŝi estus pardoninta min = She would have forgiven me
• se mi tuj estus dirinta... = if I had immediately said...

To an English speaker, this may feel unusual, because standard English usually avoids would have in the if-clause. But in Esperanto, se mi estus dirinta is a normal way to express a past contrary-to-fact condition.

In other words, the sentence describes something unreal in the past:

• I did not say it right away.
• Therefore, she did not forgive me.

Dirus usually means would say, while estus dirinta means would have said.

So:

• mi dirus = I would say
• mi estus dirinta = I would have said

That difference matters here. The sentence is about a missed past action, not a present or future possibility.

Compare:

• Ŝi pardonus min, se mi tuj dirus...
  = She would forgive me if I said right away...
  This sounds more like a present/future hypothetical.

• Ŝi estus pardoninta min, se mi tuj estus dirinta...
  = She would have forgiven me if I had said right away...
  This is clearly about an unreal past situation.

Because min is the direct object of pardoni.

In Esperanto, the direct object takes -n.

• mi = I
• min = me

So:

• Ŝi pardoninta min = She had forgiven me / would have forgiven me

The person being forgiven is the object, so min is required.

Ke introduces a subordinate clause, like English that.

So:

• mi dirinta, ke la kulpo estis mia
• I had said that the fault was mine

After verbs like diri, scii, pensi, kredi, ke is very common.

It simply marks the content of what was said.

La kulpo means the fault or the blame in this specific situation.

The article la is used because this is a definite, understood fault: the one being discussed.

Then mia stands by itself after estis and means something like mine.

So:

• la kulpo estis mia = the fault was mine

Even though mia is technically the possessive form my, Esperanto often lets possessive words stand alone when the noun is understood.

So mia here effectively means:

• my fault
• or more naturally in English, mine

Because the clause is referring to that past situation.

• ke la kulpo estis mia = that the fault was mine

The speaker is talking about what they would have said at that time, about that event. So estis is the most natural tense.

Esperanto does not force tense changes exactly the way English sometimes does. It generally chooses the tense that fits the actual time of the situation being described.

Here:

• the saying would have happened in the past
• the fault belonged to the speaker in that past situation

So estis fits well.

Estus mia would sound like would be mine, which is not the intended idea here.

Tuj means immediately, right away, or at once.

Here it modifies estus dirinta:

• if I had said immediately

The current placement, se mi tuj estus dirinta, is natural and clear.

Because Esperanto word order is fairly flexible, other placements are also possible, for example:

• se mi estus tuj dirinta
• se mi estus dirinta tuj

These are all understandable, though the original wording is very normal.

It is correct and perfectly understandable, but it is more precise and somewhat more formal than everyday simple forms.

Esperanto often prefers simpler forms when the meaning is clear from context, but compound forms like:

• estus dirinta
• estus pardoninta

are used when a speaker wants to clearly express would have done rather than just would do.

So a learner should recognize them well, even if they may not use them constantly in casual speech.