Which is the correct verb in the lament and its grammatical basis?

Conditions of the Predicate: Ellipsis, Reconstruction and Expression

• Li-yabki, a jussive imperfect after the lām of command
• Labbayka, a jussive past verb
• Li-yabki is a verbal noun, not a jussive verb
• Yabkī, the accusative noun of anna