Which of the following words may be used to introduce an adverb clause? select all that apply.
if
though
while
who

As a part of setting what time of year does the author use to demonstrate the theme in nothing gold can stay.nature’s first green is gold, her hardest hue to hold. her early leaf’s a flower; but only so an hour. then leaf subsides to leaf. so eden sank to grief, so dawn goes down to day. nothing gold can stay.