By the Old English period, new class I weak verbs had stopped being produced, but so many had been coined in Proto-Germanic that they were still by far the most common kind of verb in Old English. These verbs are often recognizable because they feature i-umlaut of the word they were derived from, as in "dēman" ("to judge") from "dōm" ("judgment"), "blǣċan" ("to bleach") from "blāc" ("pale"), "tellan" ("to count") from "tæl" ("number"), and "rȳman" ("to make room") from "rūm" ("room"). They are also the source of alterations in Modern English such as "feed" ~ "food", "fill" ~ "full", and "breed" ~ "brood".