not > [it not]
4 But it must doubled be with death of twain?
twain > two
5 For naught for me but death there does remain."
For > Because
6 "O daughter dear," said she, "despair no whit;
daughter > {Girl, maiden; also a term of affectionate address used by any older person to a girl or young woman}
7 For never sore, but might a salve obtain:
never > [there was never a]
8 That blinded god, who has you blindly smitten,