linguistics1-8  Exercise 1: Applying Grimm's Law
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  (a) Latin dens (dent-)  "tooth"   ->  English tooth    d -> t
  (b) Latin cor (cord-)   "heart"   ->  English heart    k -> h
  (c) Latin tu            "you"     ->  English thou     t -> th (the older
                                        form of "you"; modern "you" is a
                                        different, later development)
  (d) Latin duo           "two"     ->  English two      d -> t

The changes follow the table: p -> f, t -> th, k -> h, d -> t. Each holds in
every word with that sound, which is what makes the change regular rather
than a set of coincidences. (Spelling can hide a match: the c of cor is
pronounced as a k in Latin, and the w of two is no longer pronounced.)