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Why in the following sentence, "by now" doesn't work? Is there any grammatical justification? -......we have traveled 500 miles. I know already that "so far", "up to now" and "until now" all work here and mean exactly the same, but I racked my brain and searched a lot. Finally I got to a deadlock and decided to ask it. (Though I had asked it in the following link one day ago, but no one had answered it before posting this question.) http://ell.stackexchange.com/questions/21363/we-have-traveled-500-miles-fill-in-the-blank?noredirect=1#comment40202_21363……………we have traveled 500 miles - Fill in the blank

Why in the following sentence, "by now" doesn't work? Is there any grammatical justification? -......we have traveled 500 miles. I know already that "so far", "up to now" and "until now" all work here and mean exactly the same, but I racked my brain and searched a lot. Finally I got to a deadlock and decided to ask it. (Though I had asked it in the following link one day ago, but no one had answered it before posting this question.) http://ell.stackexchange.com/questions/21363/we-have-traveled-500-miles-fill-in-the-blank?noredirect=1#comment40202_21363

Why in the following sentence, "by now" doesn't work? Is there any grammatical justification? -......we have traveled 500 miles. I know already that "so far", "up to now" and "until now" all work here and mean exactly the same, but I racked my brain and searched a lot. Finally I got to a deadlock and decided to ask it. (Though I had asked it in the following link one day ago, but no one had answered it before posting this question.) ……………we have traveled 500 miles - Fill in the blank

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Why in the following sentence, "by now" doesn't work? Is there any grammatical justification? -......we have traveled 500 miles. I know already that "so far", "up to now" and "until now" all work here and mean exactly the same, but I racked my brain and searched a lot. Finally I got to a deadlock and decided to ask it. (Though I had asked it in the following link one day ago, but no one had answered it before posting this question.) http://ell.stackexchange.com/questions/21363/we-have-traveled-500-miles-fill-in-the-blank?noredirect=1#comment40202_21363