I am wondering about how often Konjunktiv I is used with unexpressed hopes, wishes and thoughts. The context for this would be an essay or fiction in which the author uses Konjunktiv I with reported speech. The grammar books and online pages I have consulted do not give any real detail on what precisely counts as indirect speech in this context. So:
Er wünschte, dass er er fleißiger sei/wäre
He wishes that he was more hard working
Er dachte, dass Zack nichts gesagt habe/hat
He thought that Zack hadn't said anything
Er hofft, dass er gewinnen werde/wird
He hopes that he will win
I know there is not going to be a fixed rule, but could somebody please give some insight on which choice is likely to be made, and whether all those options are even available, thank you.