"disappear" is an intransitive verb. CJ
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Intransitive verbs cannot have an object. You can't say: I disappeared him.
Transitive verbs can have an object: I saw him.
CB
Object is something on which the verb acts. "Disappear" is an intransitive verb, that is it cannot have an object, it cannot happen on something.
The cloud just disappeared
The cloud is the subject here, not the object. We're saying something about the "cloud".
Hope it helps!