A predicative verb is a verb that behaves as a grammatical adjective. Many languages do not use the verb "is" to separate an adjective from its noun: instead, the verb "to be" is understood as part of the adjective. Egyptian uses this structure: "my mouth is red" is written as /dSr=f r=i/ (dSr=f "(it is) red", r=i "my mouth"). Other languages to use this structure include the Northwest Caucasian languages, the Athabaskan languages and some Nilotic languages.