Answer:
The answer is line 3 and 4
Step-by-step explanation:
Thou in archaic English is the second-person pronoun in the singular form, while ye is the archaic plural form of you used. When the author says: “When old age shall this generation waste, Thou shalt remain, in midst of other woe” this is addressing the reader. In this case, thou means you, in other words, “you shall remain”.