I'm puzzled. I guess the Nunca has to go first?
As explained in the lesson, you either place nunca before the verb: "Nunca llegarán a tiempo nunca" or do a double negative: "No llegarán nunca a tiempo.
I think this could be more clear. It doesn't say explicitly that nunca has to come before the verb it just has one example where nunca comes before and leaves it for readers to figure out
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