Stamattina la fotocopiatrice si è bloccata mentre copiavo il modulo.

Both are possible.

• Stamattina is a very common, natural way to say this morning
• Questa mattina means the same thing, but is a little more explicit

So:

• Stamattina la fotocopiatrice si è bloccata...
• Questa mattina la fotocopiatrice si è bloccata...

Both are correct. Stamattina is simply more compact and very frequent in everyday Italian.

Yes. Fotocopiatrice is a feminine noun, so it takes:

• la in the singular
• le in the plural

Examples:

• la fotocopiatrice = the photocopier
• le fotocopiatrici = the photocopiers

Because it is feminine singular, other words connected to it also match in gender and number, such as bloccata later in the sentence.

Si è bloccata means got stuck, jammed, or stopped working / froze, depending on context.

The verb is bloccarsi, which is the pronominal/intransitive form of bloccare.

• bloccare = to block, to stop something
• bloccarsi = to get blocked, to jam, to freeze, to stop functioning

So:

• Ho bloccato la porta = I blocked the door
• La fotocopiatrice si è bloccata = The photocopier jammed / got stuck

In this sentence, it is not saying that someone blocked the photocopier. It means the machine stopped working by itself.

It looks reflexive, but here it is better understood as a verb describing a change of state: bloccarsi = to become blocked / to jam.

English learners often first meet si as meaning herself / himself / itself, but in Italian many verbs use si in ways that do not translate literally as reflexive verbs in English.

Here, si è bloccata does not mean the photocopier blocked itself in a literal sense. It simply means:

• it jammed
• it got stuck
• it froze

This is very common in Italian with machines, doors, computers, traffic, etc.

Because bloccarsi takes essere as its auxiliary in the passato prossimo.

Many intransitive and pronominal/reflexive verbs use essere, not avere.

So the pattern is:

• si è bloccato = he/it got stuck
• si è bloccata = she/it got stuck
• si sono bloccati = they got stuck

Since fotocopiatrice is feminine singular, the past participle agrees:

• la fotocopiatrice si è bloccata

If the noun were masculine, you would get:

• il computer si è bloccato

Because when a verb uses essere in compound tenses, the past participle usually agrees with the subject in gender and number.

The subject here is:

• la fotocopiatrice = feminine singular

So the participle becomes:

• bloccata = feminine singular

Compare:

• Il computer si è bloccato = masculine singular
• La stampante si è bloccata = feminine singular
• I computer si sono bloccati = masculine plural
• Le stampanti si sono bloccate = feminine plural

Because mentre often introduces an ongoing background action, so Italian commonly uses the imperfetto.

• copiavo = I was copying

The sentence structure is:

• a completed event: la fotocopiatrice si è bloccata
• an action in progress at that moment: mentre copiavo il modulo

So the idea is:

• The photocopier jammed while I was copying the form

This is a very common contrast in Italian:

• passato prossimo for the main completed event
• imperfetto for the background or ongoing action

Normally, no—not in this context.

After mentre, when you mean while I was doing X, Italian typically uses the imperfetto:

• mentre copiavo = while I was copying

Using ho copiato would suggest a completed action, and it does not fit naturally with the idea of another event interrupting it.

So:

• La fotocopiatrice si è bloccata mentre copiavo il modulo = natural
• La fotocopiatrice si è bloccata mentre ho copiato il modulo = not natural here

Mentre usually means while.

It introduces an action happening at the same time as another one.

In this sentence:

• la fotocopiatrice si è bloccata = the main event
• mentre copiavo il modulo = what was going on at that moment

So mentre connects the two actions in time.

You can use it in many everyday sentences:

• Mentre studiavo, mi ha chiamato Marco = While I was studying, Marco called me
• Mentre cucinava, ascoltava la radio = While she was cooking, she was listening to the radio

Italian usually leaves out subject pronouns when they are not needed.

The verb ending already tells you the subject:

• copiavo = I was copying

So io is unnecessary unless you want emphasis or contrast.

Natural version:

• mentre copiavo il modulo

Emphatic version:

• mentre io copiavo il modulo

That second version is grammatically correct, but it would usually sound marked unless you are contrasting I with someone else.

Yes. Il modulo usually means the form, especially an official or administrative form to fill in, submit, or copy.

Examples:

• compilare un modulo = to fill out a form
• firmare un modulo = to sign a form
• copiare un modulo = to copy a form

So in this sentence, the speaker was copying a document or form when the machine jammed.

The given order is very natural:

• Stamattina la fotocopiatrice si è bloccata mentre copiavo il modulo.

But Italian word order is somewhat flexible, especially with time expressions.

You could also say:

• La fotocopiatrice si è bloccata stamattina mentre copiavo il modulo.

This still sounds natural. Starting with Stamattina simply puts the time frame first.

What is less flexible is the internal structure of the verb phrase:

• si è bloccata should stay together as a unit

So do not break it up in unnatural ways.

In this sentence, copiavo does not change according to the speaker’s gender.

So:

• a man can say mentre copiavo il modulo
• a woman can also say mentre copiavo il modulo

The only agreement here is with la fotocopiatrice, which is why you have bloccata.

So the sentence stays the same regardless of whether the speaker is male or female.

Yes, very often. It is a very useful everyday expression.

Examples:

• Il computer si è bloccato = The computer froze
• La stampante si è bloccata = The printer jammed / stopped working
• La porta si è bloccata = The door got stuck
• Il traffico si è bloccato = Traffic came to a standstill

So this is a common pattern in Italian for things that stop moving or functioning properly.

A rough pronunciation guide is:

stah-maht-TEE-nah lah foh-toh-koh-pyah-TREE-cheh see eh blohk-KAH-tah MENT-reh koh-pyah-voh eel MOH-doo-loh

A few useful notes:

• stamattina has stress on -ti-
• fotocopiatrice has stress on -tri-
• bloccata has stress on -ca-
• mentre is pronounced roughly MEN-treh
• modulo has stress on mo-

Also note:

• ci in fotocopiatrice sounds like chee
• è is pronounced like eh

It uses a very common Italian narrative pattern:

• passato prossimo for the event that happened: si è bloccata
• imperfetto for the ongoing background action: copiavo

So the structure is:

• completed event
  • ongoing action in progress

This is one of the most important contrasts in Italian past tenses.

A simple formula is:

• Something happened = passato prossimo
• while something else was going on = imperfetto

That is exactly what you see in this sentence.