Even though we were late,

The underlined phrase is...
Select one:
an independent clause.
a subject.
a predicate.
a dependent clause.

Dependent clause or predicate.

Explanation:

A dependent clause can't make a complete sentence like an independent sentence.

It may also be a predicate since it's talking about a specific  person or action.

imparadis't in one anothers arms  

the happier eden, shall enjoy their fill  

of bliss on bliss, while i to hell am thrust,  

where neither joy nor love, but fierce desire,  

among our other torments not the least,  

still unfulfill'd with pain of longing pines;  

yet let me not forget what i have gain'd  

from their own mouths; all is not theirs it seems:  

one fatal tree there stands of knowledge call'd,  

forbidden them to taste: knowledge forbidd'n?  

suspicious, reasonless. why should their lord  

envie them that? can it be sin to know,