The past tense of the word "glow" is "glowed". It's part of a large family of regular verbs in English that form their past tense by adding "-ed" to the base verb. In this case, we add "-ed" to "glow" and get "glowed". Now here's something intriguing about English: some verbs are irregular and they change entirely in the past tense. But "glow" isn't one of those tricky ones, it follows the rules.
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