kakne -ka'e- gismu

x1 is able to do/be/capable of doing/being x2 (event/state) under conditions x3 (event/state).

Also: has talent; know how to; know how to use (= plika'e). (cf. stati, certu, gasnu (in the time-free potential sense), cmavo list ka'e, cmavo list nu'o, cmavo list pu'i, djuno, zifre)

In notes:

x1 is an expert/pro/has prowess in/is skilled at x2 (event/activity) by standard x3.
x1 knows fact(s) x2 (du'u) about subject x3 by epistemology x4.
x1 [person/agent] is an agentive cause of event x2; x1 does/brings about x2.
x1 has a talent/aptitude/innate skill for doing/being x2.
x1 is free/at liberty to do/be x2 (event/state) under conditions x3.
attitudinal: competence - incompetence/inability.
x1 = k1 is able/can do x2 = k2 = d2 (state/event) under conditions x3 = k3 (state/event) in time x4 = d1.
f1 = k1 [sequence] is able to be / capable of being reversed from / into sequence f2 by event k2 under conditions k3 (event / state).
k1=f1 is incapable of opposing f2 (person/force/mass) about f3 (abstract) underconditions k3 (event/state).
x1 becomes incapable of writing characters x2 of alphabet/writing system x3, which is reflects chinese culture/languge/etc. in aspect x4 and which represent x5, on writing surface/medium x6 with writing implement x7 under conditions of being incapable x8 under conditions of becoming incapable x9, as a result of x1 making excessive use of x10 which is a computer for purpose x11 or x12 which is a phone connected to network x13, used for purpose x14, excessive by amount x15.
k2 (event/state] [can be done]/[is capable of being done] by k1 under conditions of k3 (event/state).
p2=c1 brings hope.
l2=k1 is trustworthy for l1 to bring about/ensure/maintain l3 under conditions k3