La, sign of the past, when added to lah, sign of the potential, has the sense of the pluperfect, e.
"The Khasis"
P. R. T. Gurdon
We ought to use the pluperfect and say wakened, but woke is better and was always used by Peter.
"Peter and Wendy"
James Matthew Barrie
Of two past actions the prior is expressed by the pluperfect tense; of two future actions the prior is expressed by the future perfect tense.
"Selections from Viri Romae"
Charles François L'Homond