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)