I think in the sentences below, “by” doesn't work and the only proper preposition is “until”, because all of these sentences are negative where “by” doesn't make any sense at all.
-A- She won’t be back until 5 o’clock.
-B- He will not return until Monday.
-C- Why didn't you come until 12 o’clock?
-D- I won’t be ready until Tuesday.
-E- I can’t be ready until 8 p.m.
-F- You mustn't be at home until 7 o’clock.
Whereas If we change the negative forms of these sentences to positive, we will see that "by" would be the proper preposition and then "until" would not work. Am I right?
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