Entriamo nell'edificio insieme.

Entriamo is the 1st person plural form of entrare (to enter / to go in) in the present indicative.

So it literally corresponds to we enter or we are entering, depending on context.

It can also sometimes be used like let's enter in Italian, because the 1st person plural present can have an exhortative sense. So without more context, entriamo could mean either:

• we enter / we are entering
• let's enter

Italian often drops subject pronouns when they are not needed, because the verb ending already shows who is doing the action.

Here, -iamo tells you the subject is we.

So:

• Entriamo = We enter / We are entering
• Noi entriamo = We enter / We are entering, but with extra emphasis on we

Italian usually prefers the version without noi unless you want contrast or emphasis.

Because Italian usually uses a preposition + article before a specific noun like the building.

Here:

• in = in / into
• l'edificio = the building

These combine into:

• in + l' = nell'

So:

• nell'edificio = in the building or, with entrare, more naturally into the building

You would not normally say in edificio here.

This is a normal Italian contraction of a preposition with a definite article.

With in, the combinations are:

• in + il = nel
• in + lo = nello
• in + la = nella
• in + l' = nell'
• in + i = nei
• in + gli = negli
• in + le = nelle

Since edificio is masculine singular and starts with a vowel, it takes l':

• l'edificio

So:

• in + l'edificio = nell'edificio

Edificio is masculine singular.

That is why its article is:

• l'edificio = the building

Even though it ends in -o, which is often masculine, the important thing is that it begins with a vowel, so instead of il edificio, Italian uses l'edificio.

In this sentence, it is best understood as into the building because the verb entrare expresses movement inward.

So even though in often means in, with entrare the whole phrase naturally means:

• enter the building
• go into the building

Italian often says entrare in somewhere, where English may simply say enter without into.

Insieme means together, and placing it at the end is very natural in Italian.

So:

• Entriamo nell'edificio insieme. = We enter the building together.

The final position gives a smooth, natural rhythm. Italian adverbs are often flexible, but this placement is very common.

You could also hear other word orders in some contexts, but this one is standard and natural.

Yes. Entriamo insieme nell'edificio is also grammatical.

Both are possible:

• Entriamo nell'edificio insieme
• Entriamo insieme nell'edificio

The difference is mostly one of focus and rhythm:

• ...insieme at the end slightly emphasizes together
• insieme earlier in the sentence may sound a little more neutral in some contexts

Both are correct.

Yes, very often.

Italian commonly says:

• entrare in casa = to go into the house / to enter the house
• entrare nel negozio = to go into the shop
• entrare nell'edificio = to go into the building

This is a difference from English, where enter can directly take an object without into:

• English: enter the building
• Italian: entrare nell'edificio

Yes, absolutely.

Because entriamo can function as a 1st person plural suggestion or invitation, the sentence can also mean:

• Let’s go into the building together
• Let’s enter the building together

Context and tone decide whether it is a statement (we are entering) or a suggestion (let’s enter).

The apostrophe shows that the article is l', attached to a noun beginning with a vowel:

• nell'edificio

You pronounce it smoothly, without a pause between the parts. The ll in nell' is pronounced clearly, then you continue straight into edificio.

A rough guide is:

• nel-leh-DEE-fee-cho

The apostrophe is written, but in speech it just sounds like one connected word.

Yes, but it is a bit more specific or slightly more formal than some other words.

Edificio means building in a general sense. It is perfectly normal Italian.

Depending on context, Italians might also use words like:

• palazzo = building, often a large building or apartment block
• casa = house / home

So edificio is correct and natural when you specifically mean building.

You could, but it would not mean exactly the same thing.

• Entriamo nell'edificio insieme focuses on the act of entering
• Andiamo nell'edificio insieme sounds more like we go to/into the building together

With entrare, the idea of crossing into the building is clearer and more precise. So in this sentence, entriamo is the better verb if the action is specifically entering.