Spelling Standard I, Basic Spelling
Lesson 160, Prefixes and Suffixes
Knowing that most prefixes and suffixes are spelled the same no matter what word they are added to
Knowing the following prefixes and suffixes that are always spelled the same: re-, en-, con-, pre-, de-, dis-, non-, in-, un-; -ment, -ed, -ing, -ness
Knowing that some suffixes which mean the same thing are spelled differently according to the root word with which they are used: -ion, -ian, -ance, -ence, -ly, -ally, -ous, -eous, -uous, -ible, -able