Via mesaĝo surprizis min, kaj la novaĵo surprizos ankaŭ ŝin.

Because min is the direct object form of mi.

In Esperanto, the direct object usually takes -n. Here, via mesaĝo is the thing doing the surprising, and min is the person being surprised:

• via mesaĝo = the subject
• surprizis = surprised
• min = me

So the structure is Your message surprised me, not I surprised your message.

Because the verb surprizi works like English to surprise: the thing that causes surprise is the subject.

So:

• Via mesaĝo surprizis min = Your message surprised me

A native English speaker may also think of I was surprised by your message, but that is a different structure. In Esperanto, the given sentence uses the active pattern, just like English does in Your message surprised me.

Via is the possessive form related to vi, and it means your.

It behaves like an adjective, so it goes before the noun:

• via mesaĝo = your message

Since vi in Esperanto can mean singular you, plural you, formal you, or informal you, via can also mean your in any of those senses. The sentence itself does not tell you which one is meant.

Because it agrees with mesaĝo, and mesaĝo is the subject here, not the object.

In Esperanto, adjectives and possessive words such as via, mia, lia, etc. match the noun they describe in number and case. Here:

• via mesaĝo = singular, no accusative

So via stays just via.

If the noun were a direct object, both words would change:

• Mi legis vian mesaĝon = I read your message

There, both vian and mesaĝon take -n.

Because possessive words like via, mia, ŝia, etc. normally already make the noun definite.

So Esperanto usually says:

• via mesaĝo = your message

not:

• la via mesaĝo

That would sound unnatural in normal Esperanto.

They are different tense endings of the same verb surprizi:

• -is = past
• -os = future

So:

• surprizis = surprised
• surprizos = will surprise

That is why the first clause talks about a past event, while the second talks about a future one.

For the same reason as min: it is a direct object.

• ŝi = she
• ŝin = her

In la novaĵo surprizos ankaŭ ŝin, the news is the subject, and ŝin is the person who will be surprised. So the accusative -n is required.

Ankaŭ means also or too.

Its position often shows what it is emphasizing. In this sentence:

• surprizos ankaŭ ŝin

the most natural reading is will surprise her too / will also surprise her.

Putting ankaŭ before ŝin focuses on her as an additional person affected by the news.

Yes, but the emphasis may change.

For example:

• la novaĵo ankaŭ surprizos ŝin
• la novaĵo surprizos ŝin ankaŭ

All of these can be understood, but surprizos ankaŭ ŝin most clearly highlights her too.

Esperanto allows some flexibility, but word placement often affects nuance rather than basic meaning.

La means the, so la novaĵo means the news or the piece of news.

Using la usually suggests that the speaker has a specific news item in mind, something already known from context. Without la, novaĵo would sound more like a piece of news.

So:

• la novaĵo = a particular news item
• novaĵo = some news item, not specifically identified

It comes from:

• nova = new
• -aĵ- = a concrete thing or item characterized by the root

So novaĵo literally means something like a new thing, but in actual usage it commonly means news, a piece of news, or news item.

This is a very useful Esperanto word-building pattern. For example:

• bela = beautiful
• belaĵo = a beautiful thing

So novaĵo is a good example of how suffixes create vocabulary.

Yes, Esperanto allows more word-order freedom than English, mainly because the accusative -n helps show who is the object.

For example, the first clause could also be:

• Min surprizis via mesaĝo

That still means Your message surprised me, not I surprised your message, because min clearly marks the object.

Still, Via mesaĝo surprizis min is the more neutral and straightforward order.

Because the sentence joins two full clauses:

• Via mesaĝo surprizis min
• la novaĵo surprizos ankaŭ ŝin

When kaj connects two independent clauses, a comma is commonly used for clarity. It works much like English punctuation in a sentence such as:

• Your message surprised me, and the news will surprise her too.

It could be either.

Esperanto vi is used for:

• singular you
• plural you
• formal you
• informal you

So via mesaĝo can mean:

• your message addressed to one person
• your message addressed to several people

Only the wider context would tell you which one is intended.

Because they are the subjects of their clauses, not the direct objects.

In Esperanto, -n usually marks the direct object. Here:

• via mesaĝo surprised min
• la novaĵo will surprise ŝin

So the nouns doing the action stay without -n, while the pronouns receiving the action take -n.

Yes in meaning, but not in grammar.

The first clause means the same thing as:

• I was surprised by your message

But Esperanto here uses the active form:

• Via mesaĝo surprizis min

If you wanted a passive-style version, you could say something like:

• Mi estis surprizita de via mesaĝo

That means essentially the same thing, but it is a different construction from the one in your sentence.