Question

He can speak English very well change into passive voice

Answer 1

Answer:

—— said that he could speak English very well.

Answer 2

$\huge\purple{\underline{\mathfrak{Required\:Answer\:↴}}}$

English can be spoken by him very well.

Structure :

Object + modal + be + past participle form of the main verb + by + Subject

Explanation :

To change sentences having modal verb into passive voice, auxiliary verb "be" should be placed between the modal and the past participle form of the main verb.