1. vowel change
1.1. i -> a
1.1.1. begin- began
1.1.2. swim - swam
1.1.3. drink -drank
1.1.4. sit -sat
1.2. ow/aw -> ew
1.2.1. blow- blew
1.2.2. grow - grew
1.2.3. know - knew
1.2.4. draw-drew
1.2.5. throw -threw
1.3. ea -> o
1.3.1. break- broke
1.3.2. speak -spoke
1.4. i - u
1.4.1. dig-dug
1.4.2. sting -stung
1.4.3. stick -stuck
1.4.4. strike - struck
1.5. ive - ove
1.5.1. dive - dove
1.5.2. drive - drove
1.6. i - ou
1.6.1. fight - fought
1.6.2. find - found
1.7. ee - o
1.7.1. freeze-froze
1.8. i-o
1.8.1. ride-rode
1.8.2. rise-rose
2. consonant change
2.1. d -> t
2.1.1. bend -bent
2.1.2. build -built
2.1.3. lend - lent
2.1.4. send - sent
2.1.5. spend - spent
2.2. eep -> ept
2.2.1. keep - kept
2.2.2. sweep -swept
2.2.3. sleep -slept
2.2.4. weep -wept
2.3. Ø -> t
2.3.1. burn -burnt
2.3.2. deal - dealt *
2.3.3. dream - dreamt*
2.3.4. mean- meant*
2.4. ee -> e
2.4.1. feed -fed
2.4.2. bleed -bled
2.4.3. breed -bred
2.4.4. meet -met
2.4.5. speed -sped
2.5. eel -elt
2.5.1. kneel -knelt
2.5.2. feel -felt