drowned; to end; to die; to inundate

haven't; hasn't; doesn't exist; to not have; to not be

it's not important; it's nothing; never mind; to have nothing to do; to be free; to be all right (out of danger or trouble)

that's right; sure!; rest assured!; that's good; can't go wrong

it doesn't matter; it's nothing; never mind; think nothing of it; it's my pleasure; you're welcome