can you please explain me the difference between "by the end of the 20th century" and "at the end of the 20th century". and sometimes even appears "in the end of the 20th century". what should i write?
thank you for your help
please, I have a doubt about "by".
would "by the end" mean "somewhere before the end"?
By the end of the afternoon, we had walked twenty miles.
By the end of the day we had dug up the garden.
By the end of the century, war had ceased for good.
The actions have all been completed by the time the afternoon/day/century had come to an end.
sorry, I am still uncertain about the real meaning of "by".
does the expression "good by June" (I am not sure about the actual expression) on the label of a food mean that it should only be eaten "until" June and not after June?
if so, does the "by" in your examples mean the same as "until"?