How to identify intransitive verbs

I have an advice: try to add "something" or "something good" as a kind of object after them.

it should sound good for transitive, but somehow "weird" for intransitive verbs:

Transitive:

I ate something

I like something

Intransitive

*I sleep something

*I cry something

this is a way of saying: intransitive verbs can't take an object, while transitive can! (this this the definition of the difference between them actually)