(All root words occurred in
the sixth grade minimum
list.)
abbreviate 78 abbreviates 75
absence 85 absences 75
accident 90 accidents 77
arrange 92 arranging 86
attack 94 attacked 87
attacking 94
boundary 87 boundaries 67
century 93 centuries 77
commence 85 commenced 81
commencing 74
conquer 89 conquered 80
deceive 80 deceiving 70
decide 87 decided 85
deciding 85
describe 82 describing 76
industry 96 industries 79
judge 98 judges 93
material 84 materials 75
mosquito 94 mosquitoes 59
recognize 87 recognized 85
return 98 returned 93
returning 95
salary 86 salaries 77
telegraph 98 telegraphed 90
telephone 98 telephoned 95
ventilate 87 ventilated 85
wharf 99 wharves 69
In every case but one (attacking) the derivative proved itself a harder
word to spell even though it, too, had been taught. Since it is
important that children should know how to spell such common words as
“judges,” “mosquitoes,” etc., as well as the root word, _many derived
forms must be considered as presenting new spelling problems and taught
as such_. Since it is impossible to teach all derivatives and the needs
of the pupils are varied, careful training in the formation of
derivatives must be given.