Se il portiere dell’albergo trova il cavatappi, il pasticciere apre la bottiglia per tutti.

Because Italian often uses the present indicative in sentences with se when the condition is real or possible.

So:

• Se il portiere dell’albergo trova il cavatappi... = If the hotel porter finds the corkscrew...
• ...il pasticciere apre la bottiglia per tutti. = ...the pastry chef opens / will open the bottle for everyone.

In English, the second part often sounds more natural with will open, but Italian can use the present here very naturally.

This gives a sense of:

• a real possibility
• something expected to happen if the condition is met
• sometimes even a habitual result

This is a real condition: in Italian grammar, it is commonly called il periodo ipotetico della realtà.

The pattern is:

• se + present indicative
• main clause with present, future, or sometimes imperative

Here you have:

• Se ... trova
• ... apre

It is not a hypothetical or unlikely sentence.
If it were more hypothetical, Italian would usually use different forms, for example:

• Se il portiere trovasse il cavatappi, il pasticciere aprirebbe la bottiglia per tutti.

That means something more like If the porter were to find the corkscrew, the pastry chef would open the bottle for everyone.

Because dell’ is a contraction of di + l’.

Here is the breakdown:

• albergo = hotel
• because albergo starts with a vowel, its singular definite article is l’
• so di + l’albergo becomes dell’albergo

So:

• il portiere dell’albergo = the porter of the hotel / the hotel porter

This kind of contraction is very common in Italian:

• di + il = del
• di + lo = dello
• di + la = della
• di + l’ = dell’
• di + i = dei
• di + gli = degli
• di + le = delle

Yes, portiere can mean goalkeeper, but here it clearly means hotel porter / doorman / concierge-type staff member because of dell’albergo.

So context decides the meaning:

• il portiere dell’albergo = the hotel porter
• il portiere della squadra = the team’s goalkeeper

This is a very common Italian word with more than one meaning.

Italian uses definite articles more often than English.

In this sentence, the articles show that the speaker is referring to specific people and things in the situation:

• il portiere dell’albergo = the particular hotel porter
• il cavatappi = the corkscrew they need
• il pasticciere = the specific pastry chef
• la bottiglia = the bottle in question

English sometimes leaves this more implicit, but Italian often makes it explicit with the article.

Also, with professions, Italian normally uses the article when talking about a specific person:

• il pasticciere
• il portiere

But after essere, the article is often omitted:

• Lui è pasticciere. = He is a pastry chef.

Because per tutti means for everyone in the sense of for the benefit of everyone.

So:

• apre la bottiglia per tutti = he opens the bottle for everyone

This suggests that everyone will be able to enjoy it.

If you used a tutti, that would sound more natural with verbs involving giving, showing, sending, etc.:

• dà la bottiglia a tutti = he gives the bottle to everyone

With aprire, per tutti is the natural choice here.

Yes. That is also correct.

• apre sounds more immediate, general, or vivid
• aprirà sounds more explicitly future

So both are possible:

• Se ... trova, ... apre
• Se ... trova, ... aprirà

The version with apre is very natural Italian, especially in everyday speech.

Yes, here il cavatappi is singular: the corkscrew.

A useful thing to know is that cavatappi is usually invariable, so the plural is also cavatappi:

• il cavatappi = the corkscrew
• i cavatappi = the corkscrews

This is common with some compound nouns in Italian.

Because aprire is an -ire verb that does not use -isc- in the present tense.

Its present tense is:

• apro
• apri
• apre
• apriamo
• aprite
• aprono

So il pasticciere apre is correct.

Some other -ire verbs do use -isc-, for example finire:

• finisco
• finisci
• finisce
• finiamo
• finite
• finiscono

So the learner has to memorize which -ire verbs take -isc- and which do not.

Because Italian usually does not need subject pronouns when the verb form already makes the subject clear.

Here:

• trova = he/she finds
• apre = he/she opens

And in this sentence the subjects are already stated explicitly as nouns:

• il portiere dell’albergo
• il pasticciere

So adding lui would usually sound unnecessary unless you want emphasis or contrast.

For example:

• Lui apre la bottiglia, non io. = He opens the bottle, not me.

Yes.

You can say:

• Se il portiere dell’albergo trova il cavatappi, il pasticciere apre la bottiglia per tutti.

Or:

• Il pasticciere apre la bottiglia per tutti se il portiere dell’albergo trova il cavatappi.

The meaning stays basically the same.

A punctuation note:

• when the se clause comes first, a comma is very common
• when it comes second, the comma is often omitted

Yes. In Italian, aprire la bottiglia is completely normal.

Depending on context, it can mean:

• open the bottle
• uncork the bottle

If you want to be more specific about removing the cork, Italian also has:

• stappare la bottiglia = to uncork the bottle

But in your sentence, aprire la bottiglia works perfectly well.

Because l’ is the form of the article used before a vowel, and when di combines with it, you get dell’.

So:

• l’albergo
• di + l’albergo
• dell’albergo

The apostrophe marks the shortened article form before the vowel.

You will see the same thing in many other words:

• l’amico

• dell’amico

• l’ufficio
• dell’ufficio