Question

which sentence correctly punctuates this adverb clause: when the shop is closed
we can go out to eat, when the shop is closed.
when the shop is closed we can go out to eat.
we can when the shop is closed go out to eat.
when the shop is closed, we can go out to eat.

Explanation:

When an adverb clause (dependent clause) starts a sentence, it must be followed by a comma to separate it from the independent main clause. If the adverb clause comes after the main clause, no comma is needed. The third option misplaces the clause, breaking sentence structure.

Answer:

When the shop is closed, we can go out to eat.