"Bound" here is a metaphor, as if the person were tied to their vows. This can be stated in active form. AT: "In such cases, God does not require the believing spouse to continue to obey the marriage vow" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-metaphor]])
Paul is speaking to the Corinthians as if they were one person, so all instances of "you" and "your" here are singular. (See: [[rc://en/ta/man/translate/figs-you]])
Paul uses a question to cause women to think deeply about what he is saying. AT: "you cannot know if you will save your unbelieving husband." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Paul uses a question to cause men to think deeply about what he is saying. AT: "you cannot know if you will save your unbelieving wife." (See: [[rc://en/ta/man/translate/figs-rquestion]])