39 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.
40 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.
41 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.

In other versions

and you shall warn them about the statutes and the laws, and make them know the way in which they must walk and what they must do.

Teach them his decrees and instructions, and show them the way they are to live and how they are to behave.

Instruct them about the statutes and laws, and teach them the way to live and what they must do.

Teach them God’s decrees, and give them his instructions. Show them how to conduct their lives.

And you warn them of the rules and the instructions, and you make known to them the way in which they must walk and the work that they must do.

And thou shalt teach them ordinances and laws, and shalt shew them the way wherein they must walk, and the work that they must do.

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