1. ey, ei, ea → hey, veil, break

2. h → /∅/: hour, gh → /g/: ghost, rh → /r/: rhythm

3. t → /∅/: castle

4. l /∅/: calf

5. s → /∅/: island

6. sc → /s/: scene

7. gn → /n/: gnome

8. mb → /m/: tomb

9. ch → /k, ʃ/: Christmas, machine

10. qu → /k/: antique