Breakdown of L'acrobata non sa usare questo trapezio.
questo
this (masculine)
non
not
usare
to use
sapere
to know
Questions & Answers about L'acrobata non sa usare questo trapezio.
Why use sa usare instead of può usare or riesce a usare?
Sapere + infinitive expresses a learned skill or knowing how to do something. If we used può usare (potere), it would mean they do not have permission or the opportunity to use it. If we used riesce a usare (riuscire a), it would mean they are trying to use it right now but failing (perhaps the trapeze is broken or the acrobat is injured).
Would it mean the same thing if I used conosce instead of sa?
No. Conoscere means to be familiar or acquainted with a person, place, or thing, and it can never be followed by an infinitive verb. If you said non conosce questo trapezio, it means the acrobat is not familiar with this specific trapeze (maybe they have never seen it before). Non sa usare specifically means they lack the skill or knowledge of how to operate it.
Why isn't there a preposition like a or di between sa and usare?
When used to express ability, sapere acts like a modal verb (just like potere, volere, and dovere) and attaches directly to the infinitive verb (usare) without any preposition. Remember that the other verb of ability from this lesson, riuscire, does require a preposition: non riesce a usare.