lesson generalization: when you add a suffix beginning with a vowel to a word ending with a silent E, drop the E. When you add a suffix, beginning with a consonant to a word ending in silent E, keep the E
Examples
sincere-sincerely
secure-securely
active-activity
separate-separately
name-naming
close-closely
waste-wasting
hope-hoping
care-careful
forgive-forgivable
like-likeness
move-movable
require-requirement
sincerely naming careful requirement involving securely closely forgivable settling amazing activity wasting likeness placement advancing separately hoping movable measurement improving