'Shall' in the Bible

Then said they unto him, What shall we do unto thee, that the sea may be calm unto us? for the sea grew more and more tempestuous.

And he said unto them, Take me up, and cast me forth into the sea; so shall the sea be calm unto you: for I know that for my sake this great tempest is upon you.

And Jonah began to enter into the city a day's journey, and he cried, and said, Yet forty days, and Nineveh shall be overthrown.