A foregone conclusion British American noun phrase
A result that is obvious to everyone although it hasn't officially happened.
Jack's win seems to be a foregone conclusion.
Tom's failure in the final exam is a foregone conclusion because he didn't learn anything.
Kate thought that she will win the first prize as a foregone conclusion, so she didn't put too much effort on the last round. Finally, she's got the second prize.
No vested interest in the outcome of something, usually a contest or debate
This phrase is often used when something is going to be finished or completed.
Used to indicate that what happend or will happen to one is completely deserved
'A foregone conclusion' is a noun phrase, therefore, it is often used after 'to be' in the sentence.
This phrase is used the first time in Shakespeare in Othello c.1604, Act III, Scence III, "But this denoted a foregone conclusion" but it is not certain that Shakespeare actually coined it.