Ответ:

a) bled — bleed — irregular

b) broke — break — irregular

c) burned — burn — regular

d) cut — cut — irregular

e) fell over — fall over — irregular

f) hurt — hurt — irregular

g) injured — injure — regular

h) sprained — sprain — regular

Answer: irregular — bled, broke, cut, fell over, hurt; regular — burned, injured, sprained.