'Really' in the Bible

Now the serpent was more crafty (subtle, skilled in deceit) than any living creature of the field which the Lord God had made. And the serpent (Satan) said to the woman, “Can it really be that God has said, ‘You shall not eat from any tree of the garden’?”

And the Lord asked Abraham, “Why did Sarah laugh [to herself], saying, ‘Shall I really give birth [to a child] when I am so old?’

But Isaac [wondered and] said to Jacob, “Please come close [to me] so that I may touch you, my son, and determine if you are really my son Esau or not.”

But he said, “Are you really my son Esau?” Jacob answered, “I am.”