Mi piace accarezzare la gatta quando dorme sul divano.

Because Italian expresses to like differently from English.

• Piacere literally works more like to be pleasing to
• So mi piace accarezzare la gatta is literally closer to petting the cat is pleasing to me

Here:

• mi = to me
• piace = is pleasing

That is why io piace is incorrect. Io means I, but in this structure the person who likes something is an indirect object, not the grammatical subject.

Because the verb piacere agrees with the thing being liked.

In this sentence, the thing being liked is:

• accarezzare la gatta = petting the female cat

That whole infinitive phrase is treated as singular, so Italian uses:

• piace = singular

Compare:

• Mi piace leggere. = I like reading.
• Mi piacciono i libri. = I like books.

In the second example, i libri is plural, so the verb becomes piacciono.

Because after piacere, Italian often uses an infinitive to say that someone likes doing something.

So:

• Mi piace accarezzare la gatta = I like petting the cat

This is very common in Italian:

• Mi piace nuotare. = I like swimming.
• Ti piace cucinare? = Do you like cooking?

The infinitive in Italian often corresponds to the English -ing form.

Italian uses definite articles much more often than English.

So where English might say:

• I like petting the cat

Italian naturally says:

• Mi piace accarezzare la gatta

The article la means the, and it is normally required here.

Also, gatta is specifically female cat. If you wanted a male cat, you would say il gatto. In some contexts, gatto can also be used more generally for cat.

Yes.

• gatta = female cat
• gatto = male cat

In everyday speech, gatto can sometimes be used generically for cat, but gatta clearly identifies the animal as female.

So this sentence is specifically talking about the female cat.

It means when she sleeps or when it sleeps.

Here:

• quando = when
• dorme = sleeps / is sleeping

Italian often uses the simple present where English may use either:

• when she sleeps or
• when she is sleeping

So in context, quando dorme sul divano means:

• when she sleeps on the sofa or more naturally in English,
• when she is sleeping on the sofa

The most natural interpretation is that la gatta is sleeping.

So the sentence means:

• I like petting the female cat when she is sleeping on the sofa

Italian often leaves the subject pronoun unstated when it is clear from context. There is no written lei here, but it is understood from la gatta.

Because Italian often drops subject pronouns when they are not needed.

So instead of saying:

• quando lei dorme

Italian usually just says:

• quando dorme

The verb ending and the context normally make the subject clear. Since la gatta was just mentioned, the listener naturally understands that dorme refers to her.

Sul is a contraction of:

• su = on
• il = the

So:

• su + il = sul

That gives:

• sul divano = on the sofa

This kind of contraction is very common in Italian with prepositions and articles.

Other examples:

• nel = in + il
• dal = da + il
• al = a + il

Because sul divano means on the sofa, which is the normal expression here.

• su = on
• in/nel = in/inside

A cat sleeping sul divano is resting on top of the sofa cushions, which is the usual image.

You would use nel divano only in unusual situations, like if something were literally inside the sofa.

Yes, it can.

Italian quando can mean:

• when
• whenever, depending on context

So the sentence could mean either:

• I like petting the cat when she is sleeping on the sofa or
• I like petting the cat whenever she sleeps on the sofa

Usually the intended meaning is understood from the situation.

Because Italian does not need io here, and this word order is the most natural.

Italian commonly starts with the indirect object pronoun in piacere constructions:

• Mi piace...
• Ti piace...
• Gli piace...

Adding io would usually be unnecessary unless you want emphasis or contrast.

For example:

• A me piace, a lui no. = I like it, but he doesn’t.

So in a neutral sentence, Mi piace accarezzare la gatta is exactly what a native speaker would expect.

Yes, absolutely.

That version uses a direct object pronoun:

• la = her / it
• accarezzarla = to pet her

So:

• Mi piace accarezzarla quando dorme sul divano

means the same as the original sentence, assuming it is already clear that la refers to the cat.

This version is often more natural if the cat has already been mentioned before.

Yes. Accarezzare is a very natural verb here.

It means:

• to stroke
• to caress
• to pet

For an animal like a cat, accarezzare is exactly the right kind of word.

Depending on context, English might translate it as:

• pet
• stroke

So accarezzare la gatta can be understood as to pet the cat or to stroke the cat.

Yes, both are possible depending on the context.

Italian present tense often covers both:

• a habitual action: sleeps
• an action happening now/in a scene: is sleeping

So quando dorme sul divano may mean:

• when she sleeps on the sofa or
• when she is sleeping on the sofa

English chooses between those two more often than Italian does.

Yes, most likely.

Because it says la gatta, it normally refers to:

• the female cat
• a specific cat known to the speaker and listener, or understood from context

If you wanted to speak more generally about cats, Italian would usually use a different structure, such as a plural or a more general statement. Here, la gatta suggests one particular cat.