11. How do I add a suffix to words ending in silent ‘e’? Drop a silent ‘ e’ before adding a suffix that begins with a vowel: Examples: hope + ing = hop ing , believe + able = believ able If a word ends with a silent ‘ e’ , do not drop the ‘ e’ when adding a suffix that begins with a consonant. Examples: care + less = care less , safe + ty = safe ty , arrange + ment = arrange ment .
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19. When should I use double consonants at the end of a word? Occur, prefer , refer , take a double rr after stressed syllables, but keep a single r after unstressed ones: For example: prefe rr ed, refe rr ed, occu rr ed, prefe r ence, refe r ence