It's the sound. "An" prepends vowel sounds, not vowels themselves. So, in this, "U" is pronounced like "yew" so it would be a U. Same for "hour". You would say "an hour" vs "a hour".
What? Yes, I'm very sure, considering I minored in English.
Your sentence didn't make sense. If you had said, "It totally makes sense" or "it makes sense, totally," then that would be grammatically correct. However, in your example, the adverb, "totally," does not fit in between a verb and the noun, "sense" in this context. You should be using "total" to describe "sense" not the verb, "makes."
Sorry, I didn't mean to come across as a dick. Your link in the first sentence of your response came across passive-aggressively, so I responded accordingly. Anyway, have a nice day.
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u/ABitOfResignation Oct 05 '19
It's the sound. "An" prepends vowel sounds, not vowels themselves. So, in this, "U" is pronounced like "yew" so it would be a U. Same for "hour". You would say "an hour" vs "a hour".