Prima di consegnare il tema, controllo ogni virgola.

Because after prima di in Italian, you normally use the infinitive when the subject is the same as in the main clause.

So:

• Prima di consegnare il tema, controllo ogni virgola. = Before handing in the essay, I check every comma.

Here, the same person does both actions: I hand it in, and I check it.

You cannot say prima di consegno because after di you do not use a finite verb like consegno. You use the infinitive: consegnare.

If the subject changes, Italian often uses prima che + subjunctive instead:

• Controllo ogni virgola prima che il professore legga il tema. = I check every comma before the teacher reads the essay.

Italian often leaves out subject pronouns when they are clear from the verb ending.

• controllo already means I check

So io is not necessary here. You could say io controllo, but it is usually added only for emphasis, contrast, or clarity.

For example:

• Io controllo ogni virgola, lui no. = I check every comma, he doesn’t.

In the original sentence, controllo by itself is perfectly natural.

In school-related Italian, tema often means an essay or composition, especially a written assignment.

So in this sentence, il tema is best understood as:

• the essay
• the paper
• the composition

Although tema can sometimes correspond to theme in other contexts, here that would sound unnatural in English. A native English speaker should usually think of tema here as essay.

Italian uses articles much more often than English.

Here, il tema means the essay or the assignment, referring to a specific piece of writing. In Italian, leaving out the article would usually sound wrong.

So:

• consegnare il tema = hand in the essay

not:

• consegnare tema ❌

This is very common in Italian. Nouns often need an article where English might not.

Because ogni is followed by a singular noun, even though its meaning is plural in English.

So:

• ogni virgola = every comma
• ogni parola = every word
• ogni pagina = every page

Not:

• ogni virgole ❌

This is a very common pattern in Italian:

• ogni studente
• ogni giorno
• ogni volta

Even though English sometimes makes learners expect a plural idea, Italian keeps the noun singular after ogni.

No. In this sentence, controllare means to check, to look over, or to inspect.

So:

• controllo ogni virgola = I check every comma

This is a classic false friend for English speakers, because controllare often looks like to control, but very often it actually means to check.

Depending on context, controllare can sometimes mean to monitor or to keep under control, but here the meaning is clearly check.

Yes, it could come later.

The original sentence:

• Prima di consegnare il tema, controllo ogni virgola.

could also be:

• Controllo ogni virgola prima di consegnare il tema.

Both are correct. The difference is mostly one of style and emphasis.

Starting with Prima di consegnare il tema puts the time frame first, a bit like setting the scene:

• Before handing in the essay, ...

Putting it later is also very natural:

• I check every comma before handing in the essay.

Because Prima di consegnare il tema is an introductory phrase placed before the main clause.

So the sentence is structured like this:

• Prima di consegnare il tema, = introductory time expression
• controllo ogni virgola. = main clause

In English, we also often use a comma after an introductory phrase:

• Before handing in the essay, I check every comma.

In Italian, this comma is natural and helpful here, though punctuation can sometimes vary depending on style and sentence length.

Yes, absolutely, if it is already clear what it refers to.

• Prima di consegnarlo, controllo ogni virgola. = Before handing it in, I check every comma.

Here -lo replaces il tema.

This is very natural when the noun has already been mentioned or is obvious from context. If you want to be explicit, il tema is clearer. If the context is already established, consegnarlo sounds efficient and natural.

Yes. Controllo is the present indicative, first person singular.

It can mean:

• I check every comma as a general habit
• I’m checking every comma in the right context
• something like I always check every comma before handing in the essay

In Italian, the present tense is used broadly, just like in English in some contexts. Without more context, this sentence most naturally sounds like a regular habit or typical action.

Yes, and that helps show the pattern:

• controllo ogni errore = I check every error
• controllo ogni parola = I check every word
• controllo ogni dettaglio = I check every detail

The structure stays the same:

• Prima di
  • infinitive
• main verb in the present
• ogni
  • singular noun

So the sentence is also a useful model you can reuse in many situations.