come—coming
hope—hoping
serve—serving
appreciate—appreciating
vote—voting
2. When a suffix beginning with a consonant is added to a word ending in "e," the "e" is kept.
announce—announce-ment
hope—hope-ful
late—late-ly
care—care-less
lone—lone-some
3. "E" is retained to keep the soft sound of "c" and "g" before "a" and "o" as in notice—notice-able, and advantage—advantage-ous.
Exceptions:
Of the words commonly used in writing letters the following exceptions are to be made:
a. When a suffix beginning with a consonant is added to a word ending in "e":
(1) Only three words drop "e" before adding "ment": judgment, acknowledgment, argument.
(2) Only one word drops "e" before adding "ful": awful.
(3) Only three words drop "e" before adding "ly":