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I'm preparing for academic IELTS by writing some essays and then correcting those using a grammar correction app.
In the following sentence,
...as opposed to the modern day where the numbers are more or less equal
The app suggests using "modern-day" (hyphen added) instead of "modern day". Why is it so and is it critical?
Many thanks!
Easy answer look it up in the dictionary.
modern-day: adjective: relating to people or things from modern times and not from a time in the past: Ref C.E.D.
Modern-day engines are so much more efficient.
