Explanation

• These are some good rules to live by.
• یہ زندگی گزارنے کے لیے کچھ اچھے اصول ہیں۔
• **
• BY is best to keep the meaning of the original sentence
• **
• We use by meaning not later than to refer to arrangements and deadlines
• By and the passive.
• When we use the passive voice, we can use a phrase with by to say who did the action
• By meaning 'how to do something"
• We use by + -ing form to describe how to do something: