saknumah
śaknumaḥ — could do it; SB 3.5.48
śaknumaḥ — we are able; SB 7.3.6
na śaknumaḥ — we are incapable; SB 10.17.24
śaknumaḥ — are we able; SB 10.47.50
na śaknumaḥ — we are not able; SB 10.51.34