Exodus 18:20 New English Translation

²⁰warn^[a] them of the statutes and the laws, and make known to them the way in which they must walk^[b] and the work they must do.^[c]

Exodus 18:20 tn The perfect tense with the vav (ו) continues the sequence of instruction for Moses. He alone was to be the mediator, to guide them in the religious and moral instruction.
Exodus 18:20 tn The verb and its following prepositional phrase form a relative clause, modifying “the way.” The imperfect tense should be given the nuance of obligatory imperfect—it is the way they must walk.
Exodus 18:20 tn This last part is parallel to the preceding: “work” is also a direct object of the verb “make known,” and the relative clause that qualifies it also uses an obligatory imperfect.

New English Translation (NET)