Non-terminal nodes in dependency graphs are phrase nodes and are annotated with phrase tags. The following table lists the phrase tags used in the Quranic Arabic corpus:
|NS||جملة اسمية||Nominal sentence|
|VS||جملة فعلية||Verbal sentence|
|CS||جملة شرطية||Conditional sentence|
|PP||جار ومجرور||Preposition phrase|
|SC||تأويل مصدر||Subordinate clause|
Fig 1. Phrase tags.
Nominal and Verbal Sentences
A commonly used definition in Arabic grammar teaching material is that nominal sentences (جملة اسمية) are those that begin with nominals (nouns, pronouns, etc.) and verbal sentences (جملة فعلية) begin with verbs. However, this definition fails to cover more complex sentences such as those with verbs following negative particles, or for sentences headed by kāna and her sisters (كان واخواتها) or inna and her sisters (ان واخواتها).
A more functional definition based on dependency grammar is that nominal sentences contain the roles of subject mubtada and predicate khabar (مبتدأ وخبر), while verbal sentences contain a verb fiʿil (فعل) and the role of subject fāʿil (فاعل). From this definition, it follows that a sentence headed by kāna or her sisters (كان واخواتها) is originally a nominal sentence, and remains a nominal sentence after the introduction of kāna, since the verb is considered to be incomplete (ناقص) in this usage.