Both phrases are correct . . . they simply mean two somewhat different things.
black gone on-air for 24 sec.
You must be gone to hell.
The main verb of the sentence is "has gone missing."
Yes, that sentence is grammatically correct. It is a complete sentence with a subject (your parents) and a verb (are gone).
the will in your sentence is present tense, so it is present tense
like i gone to the store or i am gone
might have gone
My mother has not gone out. To make the sentence negative, the negative form of has ( = has not ) is used.
The garden was gone.
might have gone
might have gone
Gone through what?
black gone on-air for 24 sec.
You must be gone to hell.
gone
The main verb of the sentence is "has gone missing."
The verb phrase in the sentence "He might have gone to a friend's house" is "might have gone." This phrase indicates a possibility regarding his action of going.