Sound change is basically random changes in the way we pronounce certain letters and sounds.
The most famous sound change is Grim's Law (Rask's Rule). It's a sound change that happened early on in the history of Germanic languages.
Indo-European Germanic
P-F
T-Th
K-H
B-P
D-T
G-K
Gw-Kw
Bh-B
Dh-D
Gh-G
Gwh-Gw
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Linguistics: The Basics
Non-FictionThis book will tell you about the basics of linguistics.
