Translation:Can you demonstrate how to play the violin?
Suonare vs. giocare (to play): Giocare (checkers, chess, cards, tennis, soccer, other sports) Suonare (piano, violin, guitar, other musical instruments)
There are three verbs in this exercise. I suppose "dimostrare" needs "come" before another verb. On the other hand no preposition is needed by "potere" and "sapere" before another verb and by guidare before a noun:
- Puoi dimostrare come suonare il violino? = Can you demonstrate how to play the violin?
- Sai guidare un'automobile? = Do you know how to drive an automobile?