Faccio un'offerta prima che il venditore ambulante parta.

In Italian, the subject pronoun is often omitted because the verb ending already shows who is doing the action.

• faccio = I do / I make
• so io is usually unnecessary

You would add io only for emphasis or contrast, for example:

• Io faccio un'offerta, lui no. = I’m making an offer, he isn’t.

So Faccio un'offerta... is the most natural neutral version.

It is a case of elision.

• The full form is una offerta
• Since offerta begins with a vowel, una becomes un'

So:

• una casa
• un'offerta

This apostrophe is used with feminine una before a vowel.

A useful contrast:

• un libro = a book (masculine, no apostrophe)
• un'offerta = an offer (feminine, with apostrophe from una)

Yes. Italian commonly uses fare in many expressions where English uses make.

So:

• fare un'offerta = to make an offer
• fare una domanda = to ask a question
• fare un errore = to make a mistake

This is very normal Italian usage. Even though fare often means to do, it also covers many cases where English says make.

Because prima che is used before a full clause with its own verb, while prima di is used before an infinitive or a noun.

Here you have a full clause:

• il venditore ambulante parta

So you need:

• prima che il venditore ambulante parta

Compare:

• prima di partire = before leaving
• prima di fare un'offerta = before making an offer
• prima che parta = before he/she leaves

So the rule is:

• prima di + infinitive/noun
• prima che + conjugated verb

Because prima che normally requires the subjunctive in Italian.

• parte = indicative
• parta = present subjunctive

After expressions like prima che, Italian often uses the subjunctive because the action is viewed as something not yet completed, expected, or uncertain from the speaker’s point of view.

So:

• prima che il venditore ambulante parta = before the street vendor leaves

This is one of the most important triggers for the subjunctive to learn.

Parta is the present subjunctive, third person singular, of partire.

The present subjunctive of partire is:

• che io parta
• che tu parta
• che lui/lei parta
• che noi partiamo
• che voi partiate
• che loro partano

So in your sentence:

• il venditore ambulante parta = the street vendor leave

In English we do not usually see a special verb form here, but Italian does.

In standard Italian, no: the expected form is parta.

• Standard: prima che ... parta
• Non-standard/common mistake: prima che ... parte

Native speakers may sometimes simplify or mix forms in casual speech, but if you are learning correct Italian, you should use the subjunctive after prima che.

Italian often uses the definite article where English may use the, a, or sometimes no article depending on context.

Here, il venditore ambulante means the street vendor / the itinerant seller. It refers to a specific seller in the situation.

If you wanted a more indefinite sense, you might say:

• un venditore ambulante = a street vendor

But in this sentence, il suggests a particular vendor already known from context.

It means street vendor, peddler, or itinerant seller, depending on context.

• venditore = seller / vendor
• ambulante = traveling, mobile, going around from place to place

Together, venditore ambulante refers to someone who sells goods while moving from place to place or selling on the street or in markets.

A very common shorter phrase is also:

• ambulante on its own

For example:

• C'è un ambulante al mercato. = There’s a street vendor at the market.

Because in Italian, many adjectives normally come after the noun.

So:

• venditore ambulante = street vendor / itinerant seller

This is the regular order. While Italian sometimes places adjectives before the noun, the normal descriptive position is often after it.

Compare:

• una macchina rossa = a red car
• un uomo alto = a tall man
• un venditore ambulante = a street vendor

Yes. The Italian present tense often covers both the simple present and the present continuous in English.

So faccio un'offerta can mean:

• I make an offer
• I am making an offer

The exact meaning depends on context.

If you specifically want to stress an ongoing action, Italian can also use:

• Sto facendo un'offerta

But faccio un'offerta is perfectly natural and often enough on its own.

Yes. Italian offers several natural alternatives depending on style and context.

For example:

• Faccio un'offerta prima che parta il venditore ambulante.
  This is equally correct, with a slightly different word order.

• Faccio un'offerta prima che se ne vada il venditore ambulante.
  This means I make an offer before the street vendor goes away and can sound a bit more conversational.

• Voglio fare un'offerta prima che il venditore ambulante parta.
  = I want to make an offer before the street vendor leaves.

The original sentence is grammatically correct and natural, but these alternatives may also come up in real usage.