First, "stone like" should be hyphenated: "stone-like." The sentence as written is in active voice. If it were written in passive voice it would be: "Stone-like structures are built by corals."
The passive voice of ''what do you do'' is "what is done by you?"
"Your name is not known by me." is passive voice.
Passive voice
"Will you marry me" can be changed to passive voice as "Will I be married by you." In the passive voice sentence, the subject of the active voice becomes the object of the passive voice, and the object of the active voice becomes the subject of the passive voice.
the ball was easily caught by the captain OR (not passive but sounds better) the ball was an easy c atch for the captain
Yes, "is addressed" is in the passive voice.
Can it be changed into passive voice?
passive active A+
Yes it is passive voice.
No this sentence is not passive voice.
It is passive voice.