1. The shift of voiceless stops to voiceless fricatives, thus p > f, t > th, and k > x.
2. The shift of voiced stops to voiceless stops, thus b > p, d > t, and g > k.
3. The deaspiration of the aspirated stops, thus bh > b, dh > d, and gh > g.
Some exceptions to Grimm's Law exist, most notably those stated by Karl Verner in Verner's law.