'Suppose' in the Bible

“Now suppose a man is righteous and does what is just and right:

“Now suppose the man has a violent son, who sheds blood and does any of these things,

“Now suppose he has a son who sees all the sins his father has committed, and though he sees them, he does not do likewise.

“Son of man, speak to your people and tell them: Suppose I bring the sword against a land, and the people of that land select a man from among them, appointing him as their watchman,