" modals of lost opportunity. "* COULD HAVE means that something was possible in the past, but it did not happen." I could have travelled the world, but I never got a passport. "* COULD NOT HAVE means that something was impossible in the past." I could not have travelled the world, because I never got a passport. " * WOULD HAVE 2개 뜻 중 한가지 that shows how you wanted to do something in the past, bu..