Which version is grammatically correct and why?
Thank you!
"Colorful flashing lights" are flashing lights that are colorful. This is the usual way of putting that. "Colorfully flashing lights" are "lights that are flashing in a colorful way", which does not really make sense and would sound like a mistake for the other one.
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"Colorful flashing lights" are flashing lights that are colorful. This is the usual way of putting that. "Colorfully flashing lights" are "lights that are flashing in a colorful way", which does not really make sense and would sound like a mistake for the other one.