grammar - The doctrine I believed "to be" or "is" or "was" right



It is the doctrine I believed to be right .


It is the doctrine I believed was right.


It is the doctrine I believe is right.



What is the difference between "to be right," "was right," and "is right" used in this sentence? And why using "was right" and "is right" possible? Is it because it is used the same way as "doctrine which I think was right"?


Also, is it possible to change this question



What would you predict the mass of rocket to be?



to this



what would you predict the mass of rocket is?



since the answer would usually be "I predict that the mass of rocket is...", not this: "I predict the mass of rocket to be." Is it possible? Thank you!




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