prepositions - How to use separable three-word phrasal verbs with the object is a pronoun

I found something on this webpage: “get back from” is stated to be either:

1. 
   

   Inseparable, meaning return from somewhere, or

   
   


2. 
   

   Separable, meaning receive something originally lent to another person.

   
   
   

But there are no examples provided, so I try and make sentences myself like the following. Could you please check them if they are correct or incorrect?

• Inseparable

1. I get back from the bathroom.

1. 
   

   I get my book back from John.

   
   


2. 
   
   

   I get it back from John.

   
   


3. 
   

   I get back my book from John.

   
   


4. 
   

   I get back it from John.

   
   

Answer

Separable phrasal verbs are the ones that can take direct objects (transitive). Direct objects in the second example is my book and it.

While inseparable phrasal verbs are the ones that cannot take direct objects (intransitive). That would be the first example.

In your question, the first example seems right to me.

In the set of the second example, that would be separable phrasal verbs that have direct objects (my book and it). Take a look at this rule for separating multi-word phrasal verbs.

So, the first three sentences are in correct English. Although I sense that the third sentence sounds a bit weird to me. But it's still grammatically right based on the link I provide you and this additional one.

Meanwhile, the fourth sentence is literally wrong, since it has a pronoun (the it) that always comes between the verb (get) and the particle (back+from).

So, I summarize the correct examples for you [Better in past tense anyway]:

• 
  

  I got back from the bathroom.

  
  


• 
  

  I got my book back from John.

  
  


• 
  

  I got it back from John.

  
  



• 
  

  I got back my book from John.