Mettiamo un’etichetta su ogni scatolone e lo chiudiamo con il nastro adesivo.

Mettiamo is the 1st person plural form of mettere.

It can mean:

• we put / we are putting
• or, in the right context, let’s put

In instructions, recipes, manuals, and demonstrations, Italian often uses the present tense to describe the steps being done. So this sentence can sound like a neutral instruction such as we put a label on each box and close it with packing tape, even if English might prefer let’s or the imperative in some contexts.

Italian usually drops subject pronouns when they are not needed, because the verb ending already shows the subject.

• mettiamo = we put
• chiudiamo = we close

So noi is unnecessary unless the speaker wants emphasis or contrast:

• Noi mettiamo l’etichetta, voi chiudete i pacchi.
  = We put on the label, you close the packages.

Because etichetta is a feminine singular noun that begins with a vowel.

The full indefinite article is una, but before a vowel it becomes un’:

• una scatola
• un’etichetta

The apostrophe shows elision: una etichetta → un’etichetta.

This is different from masculine un, which normally has no apostrophe:

• un libro
• un amico

Because ogni means each / every, and it is followed by a singular noun in Italian.

So:

• ogni scatolone = each box / every box
• not ogni scatoloni

This is very common:

• ogni giorno = every day
• ogni studente = every student

Even though the idea is plural in meaning, the grammar after ogni stays singular.

Scatolone is related to scatola, but it usually means a large box, especially a cardboard box used for moving, storage, or shipping.

Italian often uses endings like -one to make a noun bigger or more emphatic:

• scatola = box
• scatolone = big box / large carton

So scatolone gives the idea of a big packing box rather than just any small box.

Because su means on / onto, and a label is placed on the surface of the box.

So:

• mettere un’etichetta su uno scatolone = put a label on a box

That is the natural preposition when something is attached to the outside surface.

Lo is the direct object pronoun meaning it here, and it refers to scatolone.

Since scatolone is:

• masculine
• singular

the correct direct object pronoun is lo.

So:

• chiudiamo lo scatolone = we close the box
• lo chiudiamo = we close it

Because the sentence is using ogni scatolone = each box.

Grammatically, ogni scatolone is singular, even though the overall meaning applies to all the boxes one by one. So Italian keeps the pronoun singular too:

• su ogni scatolone → on each box
• lo chiudiamo → we close it

The idea is distributive: for each individual box, we put on a label and close it.

In Italian, unstressed direct object pronouns usually come before a conjugated verb.

So:

• chiudiamo lo scatolone = we close the box
• lo chiudiamo = we close it

This word order is normal in Italian.

Compare:

• lo vedo = I see him/it
• la prendo = I take it
• li porto = I bring them

Pronouns are attached after the verb mainly with forms like infinitives and some imperatives:

• chiuderlo = to close it
• chiudilo = close it

Italian often uses the definite article with tools, materials, and everyday objects where English might sometimes leave it out.

So con il nastro adesivo is the natural way to say:

• with tape
• with the adhesive tape
• with packing tape

The article does not always mean a very specific tape already mentioned. It can simply sound more natural in standard Italian.

Yes, lo can mean him or it, depending on context.

For example:

• Lo vedo. = I see him / I see it

But in this sentence, the context makes it clear that lo refers to scatolone, so it means it.

In Italian, ch before e or i keeps a hard k sound.

So:

• chi sounds like kee
• che sounds like keh

That means chiudiamo is pronounced roughly kyoo-DYAH-mo.

Without the h, ci would sound different:

• ciao = chow
• cima = CHEE-ma

So the h is there to preserve the hard sound.