Did you know that different regions of the country prefer "Um" (red) vs "Uh" (blue)? At least on Twitter? I did not.
Language Log » UM / UH geography
previous post | next post ». From Jack Grieve, a few minutes after we discussed this issue at the 10.30 coffee break here at Methods in Dialectology XV in Groningen: Attached is a locally autocorrelated map based on the percent of um vs uh (i.e. um/(um+uh)) in a few billion word of geocoded …
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I understand that "er" used to be common but has pretty much disappeared.
And "ah" sometimes follows the use of "uh".