While the husband liveth (ζωντος του ανδρος). Genitive absolute of present active participle of ζαω.

She shall be c…

So then if, etc. Compare to Matthew 5:32.

She shall be called. She will be. The word used here (crhmatisei) is oft…

He merely states this as an illustration.

To illustrate the binding character of the law, Paul uses the case of a woman who is married to a husband and remains bound by law in that relation…

So then if while her husband lives
True indeed it is, that while her husband is alive, if

As long as anyone continues under the law as a covenant and seeks justification by their own obedience, they continue as a slave to sin in some for…

After showing that we are set free from sin through the grace of Christ, the Apostle now shows that through the same grace we are freed from slaver…