Answer:
Commas! They are used to separate ideas from each other, or be used in place of "and".
I think the idea is don't try to out run a tornado because it can cost your life.
This passage uses repetition to create a haunting effect in two different ways. The first way repetition is used is through literal repetition, repeating the phrase "my darling" and ending both of the final lines with the word "sea". The second form of repetition that creates this effect is the repetition of an idea. A sepulchre is an area where a person is buried, and so is a tomb, so the final two lines have the same meaning.
The change in end rhyme in from the first two lines to the last two lines is also significant, because it changes the focus of the poem from mourning the person who has been laid to rest, to the place in which she has been laid to rest.
When an author selects specific words to create a certain tone or mood, this is known as diction. Diction is dependent on the choice of words.
