Mi amiga acaba de ver la firma del pintor.

By itself, acabar often does mean to finish or to end.

• La película acaba a las ocho. = The movie ends at eight.
• Acabé mi tarea. = I finished my homework.

But the pattern acabar de + infinitive is a very common structure meaning to have just done something.

So:

• acaba de ver = has just seen / just saw

This is a fixed grammar pattern, so it is best to learn acabar de + infinitive as a unit.

Because Spanish uses present tense of acabar + de + infinitive to express the recent past.

So even though acaba is grammatically present tense, the full expression refers to something that happened a moment ago:

• Acabo de comer. = I just ate.
• Acaban de salir. = They just left.

This is one of those cases where the tense in Spanish does not match the tense you might expect in English word-for-word.

It is the verb phrase.

Breakdown:

• acaba = third-person singular form of acabar
• de = required preposition in this construction
• ver = infinitive, to see

Together, acaba de ver functions as one idea: has just seen.

The subject is:

• Mi amiga = my female friend

The direct object is:

• la firma del pintor = the painter’s signature

Because amiga is the feminine form, used for a female friend.

• amigo = male friend
• amiga = female friend

Also notice that mi does not change for gender:

• mi amigo = my male friend
• mi amiga = my female friend

So the word that shows gender here is amiga, not mi.

Usually, mi amiga simply means my female friend.

If someone wants to say my girlfriend, the most common word is:

• mi novia

In some contexts, people can use amiga in a looser or more personal way, but for learners, the safest understanding is:

• mi amiga = my female friend
• mi novia = my girlfriend

Here, firma means signature.

That is the most natural meaning in this sentence:

• ver la firma = to see the signature

Be aware that firma can also mean firm or company in some contexts, especially in formal or business language. But with del pintor after it, signature is the clear meaning here.

Because de + el contracts to del in Spanish.

So:

• de + el = del

Examples:

• la casa del profesor = the teacher’s house
• el libro del estudiante = the student’s book

Important exception: if El is part of a proper name, you do not contract it.

• de El Salvador = from El Salvador

But here el pintor is just a normal noun phrase, so de el pintor becomes del pintor.

Yes. Spanish often expresses possession with:

• noun + de + possessor

So:

• la firma del pintor literally = the signature of the painter
• natural English = the painter’s signature

This is much more common in Spanish than trying to imitate the English apostrophe structure.

Because la firma is a thing, not a person.

The personal a is normally used before a specific human direct object:

• Veo a mi amiga. = I see my friend.
• Conozco a tu profesor. = I know your teacher.

But with things, Spanish usually does not use that a:

• Veo la firma. = I see the signature.
• Compró el libro. = He bought the book.

So ver la firma is correct, with no personal a.

In many cases:

• ver = to see
• mirar = to look at

So ver focuses more on the result of perception, while mirar focuses more on the act of directing your eyes toward something.

Here, acaba de ver la firma means she caught sight of it / saw it.

If you said acaba de mirar la firma, that would sound more like she just looked at the signature.

Sometimes the two verbs overlap in real life, but this basic distinction is very useful.

Spanish uses definite articles very often, sometimes more often than English does.

Here:

• la firma = a specific signature
• del pintor = of the painter

In Spanish, possession structures commonly keep the article:

• la firma del pintor
• el coche de la doctora
• la casa del vecino

So even though English says the painter’s signature, Spanish naturally says the signature of the painter, with articles included.

Yes. In English, both can work depending on style and context.

• My friend has just seen the painter’s signature.
• My friend just saw the painter’s signature.

The Spanish structure acabar de + infinitive mainly tells you that the action happened very recently. English can express that in more than one natural way.

The sentence follows a very common Spanish pattern:

• Mi amiga = subject
• acaba de ver = verb phrase
• la firma del pintor = direct object

So the order is basically:

• Subject + Verb + Object

That is the same general order English often uses, which makes this sentence fairly straightforward once you understand acabar de + infinitive and del.