Taglio un’unghia troppo lunga prima di uscire.

Italian often leaves out subject pronouns when the verb ending already makes the subject clear. Taglio means I cut / I’m cutting, so io is not necessary.

You could say Io taglio..., but that usually adds emphasis, contrast, or clarity:

• Io taglio un’unghia, tu prepara la borsa. = I’ll cut a nail, you get the bag ready.

In Italian, the simple present often covers both ideas:

• I cut
• I’m cutting

So Taglio un’unghia troppo lunga prima di uscire can naturally mean either I cut a too-long nail before going out or I’m cutting a too-long nail before going out, depending on context.

If you wanted to strongly emphasize that the action is happening right now, you could say:

• Sto tagliando un’unghia troppo lunga...

But the simple present is very normal here.

Because unghia is a feminine singular noun, and the feminine indefinite article is:

• una before most consonants
• un’ before a vowel

So:

• una casa
• un’amica
• un’unghia

The apostrophe shows that una has been shortened before a vowel.

Yes. Unghia is a feminine noun.

So you get:

• un’unghia = a nail
• l’unghia = the nail
• le unghie = the nails

That is why the adjective is also feminine:

• lunga, not lungo

It can mean either one. Italian unghia is the general word for nail.

If you need to be specific, you can say:

• unghia della mano = fingernail
• unghia del piede = toenail

Without extra context, unghia can refer to either.

The gh keeps the g hard before i.

So unghia is pronounced roughly like OON-gya.

Compare:

• gi usually gives a soft sound, like in gelato
• ghi keeps a hard g sound

That is why Italian writes unghia and not ungia.

Here the sentence is talking about one nail that is too long. So the singular is perfectly natural.

If you wanted to say I cut my nails, Italian would more commonly say:

• Mi taglio le unghie.

So this sentence focuses on a single nail, not the whole set.

In Italian, adjectives often come after the noun, especially when they describe it in a straightforward way.

So:

• un’unghia lunga = a long nail
• un’unghia troppo lunga = a nail that is too long

This is more natural than putting the adjective before the noun.

Also, troppo modifies lunga, not unghia:

• too long, not too much nail

No. They are different:

• molto lunga = very long
• troppo lunga = too long

So troppo implies that the length is excessive or a problem.

Italian often avoids possessives with body parts when the owner is obvious from context.

So instead of saying my nail, Italian may simply say un’unghia or use a reflexive structure:

• Mi taglio le unghie. = I cut my nails.

In your sentence, Taglio un’unghia troppo lunga..., the ownership is just left unstated. It is still grammatical and understandable.

If you wanted to make it more clearly about your own body, a speaker might also say:

• Mi taglio un’unghia troppo lunga prima di uscire.

After prima meaning before, Italian commonly uses:

• prima di + infinitive when the subject is the same

So:

• Taglio un’unghia prima di uscire. Both actions have the same subject: I cut the nail, and I go out.

You cannot say prima di esco.

If the subject changes, Italian usually uses:

• prima che + subjunctive

For example:

• Taglio un’unghia prima che tu esca. = I cut a nail before you go out.

Yes. Prima di uscire and prima d’uscire are both possible.

The version with d’ is just an elided form of di before a vowel. In modern writing, many people prefer the full form di uscire, but both are correct.