missing "So"  -- (MW) The untranslated word The word translated in KJV as "so" is in its adverbial form, so it means "so," "in this manner" or "in this way."

Could-   - The word translated as "could " is a verb that means "to be strong", "to be able," or "to have powerful." It is in a form that could be a statement or a command. This type of strength is more physical and muscular. This is addressed to everyone there. The sense is "can" or "are strong." Making this the helping verb "can" makes the next verb active, when it is actually an infinitive.

n’t -  - The Greek word translated as "not" is the Greek negative used to deny objective facts, not opinions. It makes a negative statement of fact. Adding "really" to the sentence captures the same idea.

you -- This is from the second-person, plural form of the verb.

men -- (IW) There is nothing that can be translated as "men" in the Greek source.

keep watch -  (WF) "Keep watch" is from a verb that means "to be or to become fully awake." It is in the form of an infinitive, "to be fully awake." In the last few chapters, the original Greek focuses on the idea of being awake and ready. In English, this is lost because the term for awake is often translated as "watch." This verb is not active, but an infinitive, "to be awake."

with  - "With" is from the Greek word that is almost always translated as "with" or a related concept such as "among" or "by the means of".

me  - - "Me" is from the regular first-person pronoun in Greek.

one  - The word translated as "one" also means "single."

hour?​ - The word translated as "hour" means a period of time, generally, as we might say "moment." This is not the division of time used in the dark of night (the four watches) but it is the word used to divide the light of day into the twelve hours, however, this is not the day so it doesn't mean a formal "hour."