'Possibly' in the Bible

So Sarai told Abram, "You are well aware that the LORD has prevented me from giving birth to a child. Go have sex with my servant, so that I may possibly bear a son through her."

You could not possibly do such a thing: to kill the righteous with the wicked, treating the righteous and the wicked alike. You could not possibly do that! Won’t the Judge of all the earth do what is just?”

When Laban had gone to shear his sheep, Rachel [went inside the house and] stole her father’s household gods.

But they said, “The man questioned particularly about us and our relatives, saying, ‘Is your father still alive? Have you another brother?’ So we answered his questions. Could we possibly know that he would say, ‘Bring your brother down’?”

They said to him, “Why does my lord say these things? Your servants could not possibly do such a thing.