'Supposing' in the Bible

Do not think that I [am the One who] will accuse you before the Father. There [already] is one who accuses you: Moses, [the very one] in whom you have placed your hope [for salvation].

So when the Jews who were with her in the house comforting her, saw how quickly Mary got up and left, they followed her, assuming that she was going to the tomb to weep there.

Jesus said to her, “Woman, why are you crying? For whom are you looking?” Supposing that He was the gardener, she replied, “Sir, if you are the one who has carried Him away from here, tell me where you have put Him, and I will take Him away.”