Not Waving but Drowning Theme of Death. You'd think that there couldn't be a clearer distinction than the one between life and death, but "Not Waving but Drowning" goes out of its way to muddy the water, so to speak. The focus, after all, is a talking corpse who just won't shut up even though the living can't hear him.
Past tense because the verb isolated is written that way.
Answer:
Metaphor.
Explanation:
Metaphors are secret similes that dont use like or as.