La tessera vecchia non funziona più, quindi devo consegnare il modulo oggi stesso.

Because tessera is a feminine singular noun in Italian.

• la = the (feminine singular)
• vecchia = old (feminine singular form of vecchio)

In Italian, articles and adjectives usually have to agree with the noun in gender and number.

So:

• la tessera vecchia = the old card
• il modulo = the form

Notice that modulo is masculine, so it takes il, not la.

In Italian, adjectives often come after the noun.

So:

• la tessera vecchia = the old card

This is the most normal order here. Italian can sometimes place adjectives before the noun, but that often changes the tone or emphasis. For a basic descriptive meaning, putting vecchia after tessera is completely natural.

Tessera often means a card, especially a card used for access, membership, identification, transport, or services.

Depending on context, it could be something like:

• a membership card
• an access card
• a pass
• an ID-style card

So in this sentence, la tessera vecchia non funziona più means the old card is no longer working.

Yes. In a negative sentence, non ... più means no longer, not anymore, or not any longer.

So:

• funziona = it works
• non funziona più = it no longer works / it doesn’t work anymore

This is a very common Italian structure:

• Non vivo più lì = I don’t live there anymore
• Non studio più il francese = I don’t study French anymore

Here, più does not mean more in the usual quantity sense. In this structure, it means anymore / no longer.

Because Italian often omits subject pronouns when they are clear from the verb form.

• devo already means I must or I have to
• so io is not necessary

You could say:

• quindi devo consegnare il modulo
• quindi io devo consegnare il modulo

Both are grammatically correct, but the version without io is more natural unless you want emphasis.

After a modal verb like dovere (must / have to), Italian uses the infinitive of the main verb.

So:

• devo consegnare = I have to hand in / submit

Not:

• devo consegno ❌

This is the same pattern as in English:

• I must submit
• not I must submits

Other examples:

• voglio mangiare = I want to eat
• posso entrare = I can enter
• devo partire = I have to leave

Consegnare usually means to hand in, to deliver, or to submit, depending on context.

In this sentence, with il modulo, it most naturally means:

• to hand in the form
• to submit the form

So devo consegnare il modulo means I have to submit/hand in the form.

Quindi means therefore, so, or as a result.

Here it links the two ideas:

• La tessera vecchia non funziona più = The old card no longer works
• quindi devo consegnare il modulo oggi stesso = so I have to hand in the form today itself / today without delay

It often comes near the beginning of the second clause, as it does here. That placement is very natural.

Oggi stesso means today itself, which in natural English usually becomes:

• today
• as early as today
• today without fail
• today itself
• today, not later

The word stesso adds emphasis. It suggests immediacy or no delay.

Compare:

• oggi = today
• oggi stesso = today itself / today, not later / as early as today

You can see the same pattern in:

• adesso stesso = right now
• questa sera stessa = this very evening

Because in this expression, stesso works as an emphatic word meaning something like itself, very, or exactly this.

So:

• oggi stesso = this very day / today itself

This is a fixed and common expression. Italian often puts stesso after time expressions for emphasis.

Yes, you could, but the nuance may change slightly.

• la tessera vecchia = the old card
  This is the most straightforward, neutral description.
• la vecchia tessera = the old card
  This can also be correct, but sometimes it sounds a bit more interpretive, literary, or emphasis-driven.

For a learner, la tessera vecchia is the safest neutral choice in this sentence.

Because modulo is a masculine noun in Italian.

So you get:

• il modulo = the form

Not:

• la modulo ❌

Its adjective, if there were one, would also have to agree in masculine form:

• il modulo compilato = the completed form

Yes. Devo is the first-person singular of dovere, and depending on context it can mean:

• I must
• I have to
• sometimes even I should, though that depends on context

In this sentence, devo consegnare il modulo most naturally means:

• I have to hand in the form
• or I must hand in the form

Yes. The sentence is in the present tense:

• non funziona = does not work / is not working
• devo = I must / I have to

Italian often uses the present tense in situations that English also expresses with the present:

• La tessera non funziona più = The card doesn’t work anymore
• Devo consegnare il modulo oggi stesso = I have to hand in the form today

The urgency comes mainly from oggi stesso, not from a special tense.

Yes. Funzionare is very flexible in Italian. It can mean to work, to function, or to operate for many different things:

• Il computer non funziona = The computer doesn’t work
• La chiave non funziona = The key doesn’t work
• La tessera non funziona = The card doesn’t work
• Il piano funziona = The plan works

So its use here is completely natural.