Rule 1: When the suffix “full” is added to a word, one “ I” is removed.
Faith + full = faithful
Use + full= useful
Rule 2: If the word to which the suffix “full” is added ends in “ll”, one “I” is removed from the word also.
Skill +full = skilful
Will + full= wilful
Rule 3: Words of two or three syllables ending in single vowel + single consonant double the final consonant if the last syllable is stressed. Eg-
Permit + ed = permitted
Occur + ing =occurring
Control + ed =controlled
Begin + ing = beginning
Rule 4: Consonant ‘L’ is doubled in the words ending in single vowel + “I” before a suffix beginning with a vowel eg.
Signal + ing = signalling
Repel + ent = repellent
Quarrel + ed = quarrelled
Travel + er = traveller
Rule 5: Words ending in silent “e”, drop the “e” before a suffix beginning with a voweleg.
Hope + ing = hoping
Live + ed = lived
Drive + er = driver
Tire + ing= tiring
Rule 6: If the suffix begins with a consonant “e” is not dropped e.g
Hope + full = hopeful
Sincere + ly= sincerely
But,
True + ly = truly
Nine + th = ninth
Argue + ment = argument
Rule 7: A final “y” following a consonant changes to “i” before a suffix except “ing”. Eg.
Carry + ed = carried
Happy + ly = happily
Marry + age = marriage
Beauty + full = beautiful
But,
Marry + ing = marrying
Carry + ing = carrying
Rule 8: A final “y” following a vowel does not change before a suffix. Eg:
Obey + ed = obeyed
Play + er = player
Pray + ed= prayed
Rule 9: When the suffix “ous” is added to a word ending in “ce”, “e” is changed to “i”.
Space + ous= spacious
Vice + ous= vicious
Malice + ous = malicious
Grace + ous= gracious
Rule 10: When the suffix “ing” is added to a word ending in “ie”, “ie” is changed to “y”.
Lie + ing= lying
Die + ing = dying
Tie + ing= tying