The traffic was really bad twenty minutes ago.
Can we use 'prior' to replace 'ago' here? Thank you.
You can, but generally the word "prior" needs to be followed by "to" and some word or phrase to indicate exactly when it was.
For instance, you might say:
"The traffic was really bad twenty minutes prior to the start of the soccer match."
"Ago," on the other hand, indicates that the traffic was bad twenty minutes before this present moment, that is, "prior to now."
I know it is very colloquial. I heard it from a radio announcer in Chicago. That was the first time I heard 'prior' can be used like this. 'Real' is colloquially used to replace 'really' as an adverb, isn't it?
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