Voice (passive) and mood (indicative/subjunctive/jussive) are independent: yuktabu is passive indicative; lan yuktaba is passive subjunctive.
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Voice versus Mood
The Passive Verb: Past, Imperfect, and Proxy Subject
Voice (passive) and mood (indicative/subjunctive/jussive) are independent: yuktabu is passive indicative; lan yuktaba is passive subjunctive.