Где сказуемое в этом предложении? Are we going to be friends, Jane? Сказуемое - are going to be или are going to be friends.

First of all let\'s take a look at model of question sentence with the component \"to be going to do something\" :

Am / is / are(help - verb) + subject  + going to +  predicate + secondary parts of the sentences.

 let\'s take a look at sentence \"Are we going to be friends, Jane?\" 

Are -  help - verb.

You -  subject.

going to  -  compound predicate.

be- predicate.