Glossary of Linguistic Terms

Deliberative Mood

Definition: 

Deliberative mood is a directive mood which signals the speaker's request for instruction from the addressee as to whether to do the proposition expressed in the utterance.

Examples: 

(English)

Shall I water the grass?

(Afar)

The -oo suffix signals deliberative mood, as in aboo ‘Shall I do (it)?’

Source: 
107–108