Il soffitto in legno scricchiola quando camminiamo piano.

Both in legno and di legno can mean “made of wood,” but Italians often prefer in + material when describing what something is constructed from.
• in legno emphasises the material as an integral part of the object (“wooden ceiling”).
• di legno is also correct and more common in some regions or contexts, but in legno is the fixed phrase for furniture, structures, etc.

The verb’s infinitive is scricchiolare, meaning “to creak” or “to squeak.”
• scricchiola is the 3rd person singular, present indicative (il soffitto scricchiola = the ceiling creaks).
• If you talk about multiple objects: i soffitti scricchiolano.

Italian does not have a distinct continuous/progressive form. The simple present (scricchiola) covers both:
• habitual or repeated actions (“it creaks whenever…”).
• actions happening right now (“the ceiling is creaking”).
If you need to stress “right now,” you can add proprio adesso: Il soffitto sta scricchiolando proprio adesso.

Italian omits subject pronouns when the verb ending clearly indicates the subject.
• scricchiola already shows 3rd person singular, so adding esso or lui would sound redundant or overly formal.

Here piano is an adverb meaning “quietly” or “softly” (literally “lightly on the feet”).
• Some Italian adverbs end in -mente (lentamente = “slowly”), but many common ones—bene, male, piano, forte—are identical to an adjective form and don’t take -mente.
• pianamente exists but is rare, more formal and slightly different (“smoothly, evenly”).

Italian adverbs are relatively flexible in placement:
• camminiamo piano (standard, neutral).
• piano camminiamo (less common, stylistic emphasis on “quietly”).
Placing the adverb after the verb is the most natural for manner adverbs like piano.

The subjunctive in Italian follows quando only when the event is seen as hypothetical or anticipated. In this sentence the creaking is a general, habitual fact:
• Habitual/factual: quando camminiamo piano → indicative.
• Hypothetical/future: quando arriverai, ne parleremo → subjunctive can be used after some conjunctions, but for quando in future contexts you still use the indicative: quando arriverai (not arriverai in subjunctive).

Pronunciation: /skrik-ˈkjɔ-la/.
• scr = [skr], i = [i], cc (before h) = [kj], io = [jɔ].
• Stress falls on the second syllable: scrik-KIO-la.

The plural is soffitti (masculine, -o → -i).
Sentence in plural:
I soffitti in legno scricchiolano quando camminiamo piano.
• Notice scricchiolano (3rd person plural).