Dopo un tuono fortissimo, ho preso un fazzoletto perché il raffreddore mi faceva starnutire.

Dopo means after. Here it introduces what happened first: Dopo un tuono fortissimo = After a very loud thunderclap.

A useful pattern is:

• dopo + noun = after something
• dopo + infinitive / clause = after doing something / after something happened

Examples:

• Dopo pranzo = after lunch
• Dopo aver mangiato = after eating

In this sentence, dopo is followed by a noun phrase: un tuono fortissimo.

In Italian, adjectives often come after the noun, especially when they describe a quality in a straightforward way.

So:

• un tuono fortissimo = a very loud thunderclap

Putting fortissimo after tuono sounds natural and neutral.
You can sometimes place adjectives before the noun in Italian, but that often changes the tone or emphasis.

Fortissimo means very loud or extremely strong.

It comes from forte = strong / loud, plus the ending -issimo, which intensifies the adjective.

So:

• forte = loud
• fortissimo = very loud / extremely loud

This -issimo ending is very common in Italian:

• grande → grandissimo = very big
• buono → buonissimo = very good
• freddo → freddissimo = very cold

Ho preso is the passato prossimo, formed with:

• avere in the present
• past participle: preso

So:

• ho preso = I took / I got

In everyday spoken Italian, the passato prossimo is the normal way to talk about a completed past action, especially in much of Italy.

Here, taking the handkerchief is a single completed action, so ho preso fits well.

Un fazzoletto means a handkerchief or a tissue, so it introduces it as something not specifically identified before.

• un fazzoletto = a handkerchief / a tissue
• il fazzoletto = the handkerchief / the tissue

Since the sentence just says the speaker took one, not a previously known specific one, the indefinite article un is natural.

Yes. In everyday Italian, fazzoletto can refer to:

• a cloth handkerchief
• a paper tissue, depending on context

If the context is sneezing because of a cold, many learners will naturally think of a tissue, even though fazzoletto can literally also mean handkerchief.

Here perché means because and introduces the reason:

• ho preso un fazzoletto perché... = I took a tissue because...

Italian perché can mean both:

• because
• why

Examples:

• Sono rimasto a casa perché ero stanco. = I stayed home because I was tired.
• Perché sei stanco? = Why are you tired?

Also note the written accent: perché.

Italian often uses the definite article where English does not.

So:

• ho il raffreddore = I have a cold

Even though English usually says a cold, Italian uses the cold: il raffreddore.

This is very common with illnesses and physical conditions:

• ho la febbre = I have a fever
• ho il mal di testa = I have a headache

This is a very important tense contrast.

• ho preso is passato prossimo: a completed action
• faceva is imperfetto: an ongoing/background situation in the past

So the sentence contrasts:

• one completed action: I took a tissue
• one ongoing cause/background: my cold was making me sneeze

Using faceva suggests that the sneezing problem was already going on at that time. It sets the scene rather than describing one single finished event.

If you said mi ha fatto starnutire, it would sound more like:

• it made me sneeze on one specific occasion

But here the idea is more like:

• the cold was making me sneeze
• the cold kept causing sneezing

Mi means me.

So:

• il raffreddore mi faceva starnutire = the cold was making me sneeze

Italian uses fare + infinitive to express causing someone to do something:

• mi fa ridere = it makes me laugh
• mi fa piangere = it makes me cry
• mi faceva starnutire = it was making me sneeze

So mi shows who is affected by the cold.

Because after fare in this kind of structure, Italian uses an infinitive.

Pattern:

• fare + someone + infinitive
• to make someone do something

Examples:

• Mi fa dormire = It makes me sleep
• Mi fa tossire = It makes me cough
• Mi faceva starnutire = It was making me sneeze

So faceva starnutire literally works like was making sneeze, and mi supplies me.

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

• Dopo un tuono fortissimo, = After a very loud thunderclap,
• ho preso un fazzoletto... = I took a tissue...

This kind of comma is common when a sentence starts with a longer introductory phrase. It helps readability. In shorter sentences, punctuation can sometimes vary, but here the comma is perfectly natural.