Ho paura di perdere il treno se esco troppo tardi.

Because avere paura is the normal Italian expression for to be afraid.

So Italian uses to have fear, not to be afraid with essere:

• Ho paura = I’m afraid / I’m scared
• Hai paura = you’re afraid
• Aveva paura = he/she was afraid

This is one of those cases where Italian and English structure the idea differently.

After avere paura, Italian often uses di before a verb in the infinitive.

Pattern:

• avere paura di + infinitive

So:

• Ho paura di perdere = I’m afraid of missing

Other examples:

• Ho paura di sbagliare = I’m afraid of making a mistake
• Ha paura di volare = He/She is afraid of flying

If what follows is a noun, you can also use di:

• Ho paura del buio = I’m afraid of the dark

Because after di, Italian uses the infinitive when the subject stays the same.

In this sentence, the person who is afraid and the person who might miss the train are both I, so Italian uses:

• Ho paura di perdere il treno

Not:

• Ho paura di perdo il treno ❌

Compare:

• Spero di arrivare presto = I hope to arrive early
• Cerco di capire = I’m trying to understand

If the subject changes, Italian often uses a different structure, such as che + a finite verb:

• Ho paura che lui perda il treno = I’m afraid that he’ll miss the train

Italian usually uses the definite article more often than English does.

So when English says:

• miss the train

Italian naturally says:

• perdere il treno

The article is normal here. Italian often includes articles with general or expected nouns where English might not focus on them in the same way.

Because Italian commonly uses the present tense after se for real or likely future situations.

So:

• se esco troppo tardi literally looks like if I go out too late but it can mean
• if I leave/go out too late

This is very common in Italian:

• Se arrivo tardi, ti chiamo = If I arrive late, I’ll call you
• Se piove, restiamo a casa = If it rains, we’ll stay home

English often uses present tense in if clauses too, so this part matches fairly well.

Because Italian usually drops subject pronouns when they are not needed.

The ending -o already shows the subject is I:

• esco = I go out / I leave

So io is optional. You would add io only for emphasis, contrast, or clarity:

• Se esco troppo tardi, perdo il treno = neutral
• Se io esco troppo tardi, tu invece no = contrast

Yes. It comes from uscire = to go out / to leave, and the present tense is irregular.

Present tense:

• esco = I go out
• esci = you go out
• esce = he/she goes out
• usciamo = we go out
• uscite = you all go out
• escono = they go out

So esco is the correct I form of uscire.

It can feel like either, depending on context.

In this sentence:

• se esco troppo tardi

the natural English idea is often if I leave too late, especially because of the train.

But the basic verb uscire means to go out. In context, go out too late and leave too late are both close in meaning.

Because troppo means too, while molto means very.

That difference matters:

• troppo tardi = too late
• molto tardi = very late

Since the sentence expresses a negative consequence — missing the train — too late is the right idea.

Yes. Ho paura di... can range from literal fear to worry/anxiety, depending on context.

So it can sound like:

• I’m afraid of missing the train
• I’m worried about missing the train

In everyday speech, this often expresses concern rather than dramatic fear.

That is not the most natural choice here.

If the subject is the same, Italian strongly prefers:

• Ho paura di perdere il treno

The structure ho paura che... is more common when a new clause follows, often with a different subject, and usually with the subjunctive:

• Ho paura che lui perda il treno = I’m afraid he’ll miss the train

For the same subject, di + infinitive is the standard pattern.

The sentence is built like this:

• Ho paura = I’m afraid
• di perdere il treno = of missing the train
• se esco troppo tardi = if I go out / leave too late

So the full structure is:

• main clause: Ho paura
• infinitive phrase: di perdere il treno
• conditional clause: se esco troppo tardi

Italian word order here is very natural and quite close to English.

Yes, absolutely.

You can say:

• Se esco troppo tardi, ho paura di perdere il treno.

This means the same thing. Putting the se clause first may slightly emphasize the condition.

Both orders are correct:

• Ho paura di perdere il treno se esco troppo tardi.
• Se esco troppo tardi, ho paura di perdere il treno.

A few small things:

• paura is pronounced roughly PAU-ra, with pau as one syllable group.
• perdere has three syllables: PER-de-re
• treno is TRE-no
• esco is ES-ko, not like English ess-co
• tardi is TAR-di

Also, Italian pronunciation is generally more consistent than English spelling, so once you know the sound rules, this sentence is fairly straightforward to say.