tn The first verb is clearly a cohortative form, expressing the psalmist’s resolve. The second verb, while formally ambiguous, should also be understood as cohortative here.
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tn The prefixed verb with vav (ו) consecutive normally appears in narrational contexts to indicate past action, but here it continues the anticipatory (future) perspective of the preceding line. In Ps 77:6 one finds the same sequence of cohortative + prefixed verbal form with vav (ו) consecutive. In this case as well, both forms refer to future actions.