Q Is the verb TO SING a transitive or intransitive verb?

The verb "to sing" can be both transitive and intransitive, depending on the context.

Intransitive:

* When used intransitively, "to sing" does not take a direct object.

* "The birds sing beautifully." (The birds are singing, but they are not singing *something*.)

Transitive:

* When used transitively, "to sing" takes a direct object, which is the thing being sung.

* "She sings a beautiful song." (The direct object is "a beautiful song".)

So, the answer is it depends on the context.