There’s a fairly neat chiasm in the first part of Rom 7:

a. law rules while one lives
b. woman bound while husband lives; if husband dies, freed (KATARGEO)
c. while husband lives: adulteress
d. if husband dies: joined to another without adultery
e. you died through Christ, through body of Christ
d’. joined to another to bear fruit
c’. in flesh: passions operated to bring forth fruit to death
b’. liberated from law, KATARGEO
a’. serve in newness of spirit and not in oldness of letter