Dopo la discussione, Marta mi guarda e dice che sa perdonare.

Because Italian usually uses the definite article with nouns like this when referring to a specific event.

• dopo la discussione = after the discussion / after the argument
• dopo discussione would sound incomplete or unnatural in standard Italian

Here la discussione refers to a particular discussion that both speaker and listener can identify.

The comma separates the opening time phrase from the main clause:

• Dopo la discussione, = After the discussion,
• Marta mi guarda e dice... = Marta looks at me and says...

In Italian, this comma is very natural when a time expression comes first, especially in written language. It helps readability. In some short sentences, it may be omitted, but here it sounds perfectly normal.

Because mi is the normal unstressed object pronoun, and in Italian these pronouns usually come before the conjugated verb.

• Marta mi guarda = Marta looks at me

guarda me is possible, but it is more emphatic, like:

• Marta guarda me, non te = Marta is looking at me, not you

So in a neutral sentence, mi guarda is the standard choice.

It is a direct object.

That may feel strange to an English speaker because English says look at me, with at. But Italian uses guardare directly:

• guardare qualcuno = to look at someone

So:

• Marta mi guarda literally works like Marta looks me, but in natural English it means Marta looks at me

This is just a difference in verb structure between the two languages.

They are in the present because Italian often uses the present tense to make a scene feel vivid and immediate. This is sometimes called the historical present or narrative present.

So instead of saying:

• Marta mi ha guardato e ha detto... = Marta looked at me and said...

the speaker says:

• Marta mi guarda e dice... = Marta looks at me and says...

This can make the moment feel more alive, as if it is unfolding in front of you.

Che introduces the clause that reports what Marta says.

• dice che sa perdonare = she says that she knows how to forgive

After verbs like dire, pensare, credere, and sapere, Italian normally uses che to introduce a full clause.

English can sometimes drop that:

• She says she knows how to forgive.

Italian usually keeps che:

• Dice che sa perdonare.

Sapere + infinitive often means to know how to do something.

So:

• sa perdonare = she knows how to forgive

Depending on context, it can also suggest:

• she is capable of forgiving
• she has the maturity to forgive

It is not just about factual knowledge. It often describes an ability, attitude, or personal quality.

They are similar, but not the same.

• sa perdonare = she knows how to forgive / she is capable of forgiveness
• può perdonare = she can forgive / she is able to forgive in this situation
• perdona = she forgives / she does forgive

So sa perdonare focuses on a personal ability or quality. It sounds more like a statement about character.

Example:

• Sa perdonare = She is the kind of person who can forgive.
• Può perdonare = She is able to forgive, maybe because circumstances allow it.
• Perdona = She actually forgives.

Because the sentence is more general as written.

• sa perdonare = she knows how to forgive
• sa perdonarmi = she knows how to forgive me

Without -mi, the sentence talks about forgiveness in a broader sense. It describes Marta’s attitude or ability, not necessarily a specific action toward the speaker.

If the intended meaning were specifically she says she knows how to forgive me, Italian would usually say:

• dice che sa perdonarmi

Because Italian usually omits subject pronouns when they are clear from the verb ending or the context.

Here, after Marta is introduced, it is obvious that sa refers to her:

• Marta mi guarda e dice che sa perdonare.

Adding lei is possible, but it would usually add emphasis or contrast:

• ...dice che lei sa perdonare, ma gli altri no.
  = ...she says that she knows how to forgive, but the others do not.

So leaving out lei is the normal, natural choice.

It can mean either, depending on context.

• discussione can be a neutral discussion
• but it can also mean an argument or disagreement

So in this sentence, the exact tone depends on the wider context. If the conversation was tense, an English translation like after the argument might fit better. If it was simply a serious conversation, after the discussion works well.

Yes. A more straightforward past narration would be:

• Dopo la discussione, Marta mi ha guardato e ha detto che sa perdonare.

That means:

• After the discussion, Marta looked at me and said that she knows how to forgive.

The original present-tense version is not wrong at all; it just feels more immediate and dramatic.