JMNT(i)
39 "and they did not know (were not aware; took no note of the situation) until the down-wash (deluge; flood; cataclysm) came and washed [the] whole population away (or: picked up all [the] people to sweep [them] away) – thus (in this same way) will progressively be the presence of the Son of the Man!
40 "At that time two folks will continue being within the midst of the field: one man is being taken in hand (seized) and drawn to the side, and yet one man is repeatedly left alone to flow on his way (or: continues on pardoned [with his debts] forgiven; or: is being sent away, allowed to continue relaxing while permitted to depart).
41 "Two women are continuing to grind grain into meal and flour, within the mill (or: in the midst [of working] the millstone): one woman is being taken in hand (seized) and drawn to the side, and yet one woman is repeatedly left alone to continue [in her work] (or: pardoned; sent away; forgiven; etc., as in vs. 40).
42 "Therefore, you folks stay constantly awake, be ever alert, and continue watchful, because you have not seen, nor do you thus know, in what sort of day your Owner (Lord) is in the habit of coming (or: for what kind of day your Master repeatedly comes).