Il cliente vuole un pezzo che sia rapidamente sostituibile.

Questions & Answers about Il cliente vuole un pezzo che sia rapidamente sostituibile.

How is the adjective sostituibile formed here?
It is formed by taking the verb sostituire (to replace) and adding the suffix -ibile. Just like "-able" or "-ible" in English, this suffix creates an adjective meaning "capable of being [verb]ed". Because sostituire is an -ire verb, it takes the -ibile ending. Verbs ending in -are typically take -abile instead (like lavabile for washable).
Why do we use the subjunctive sia instead of the indicative è in this sentence?
The subjunctive is required here because the sentence describes an "indefinite antecedent." The customer is looking for a part that meets a specific requirement, but we don't know if this specific part actually exists yet. When a relative clause (starting with che) describes the desired traits of something you want, need, or are looking for, Italian uses the subjunctive. If they were talking about a specific, known part sitting on a table, they would use the indicative è.
Can I put the adverb rapidamente at the end of the sentence?
Yes, you could absolutely say un pezzo che sia sostituibile rapidamente. Placing the adverb before the adjective, as it is in the example, is very natural and slightly emphasizes the speed requirement.
I usually translate pezzo as "piece". Is it the standard word for a "part"?
Yes! While its literal translation is "piece," pezzo is the standard Italian term for a mechanical part or component. For instance, "spare parts" are called pezzi di ricambio.

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