The most common form of language reform involves changing the orthography of words. This is known as spelling reform. The grammar of a language also may be changed to simplify inflection, syntax, vocabulary and word formation. English for example uses many different prefixes that mean "the opposite of", like "un-", "in-/im-", "a(n)-", "de-". A language reform might suggest using only one prefix to mean "the opposite of", for example "un-". On top of this, there are words such as "good" and "bad" that roughly mean the opposite of each other, but would be better (in terms of simplicity) portrayed as "good" and "ungood", so the word "bad" is not part of the language anymore.