Sometimes a phrasal verb has an object. If the object is a pronoun (it/them/me/him etc.), only one position is possible. We have to put the object beetween the verb and the preposition.
For example: I'm going to take them off. (not take off them)
But some phrasal verbs confuse me.
For example: In dictionaries they say live off sb/sth not live sb/sth off
For example: The families are happy to live off them and use the money they earn (Why isn't it "live them off" ?