• Basic forms
• 延びる — extend; be postponed / base form
• 延びます — extends; is postponed / masu form
• 延びた — extended; was postponed / ta form
• 延びて — extending … / te form
• 延びない — does not extend; is not postponed / negative
• 延びれば — if (something) extends / conditional
• Common expressions
• 工事が延びる — construction is delayed
• 会議が延びる — the meeting runs long
• 寿命が延びる — lifespan increases
• More
• 延びている — is extended; is delayed / state

延びる（のびる） is an ichidan intransitive verb. It describes something becoming longer or being postponed without focusing on who caused it.

• Basic forms
• 延ばす — extend; postpone / base form
• 延ばします — extends; postpones / masu form
• 延ばした — extended; postponed / ta form
• 延ばして — extending … / te form
• 延ばさない — do not extend; do not postpone / negative
• 延ばせば — if (one) extends / conditional
• Common expressions
• 期限を延ばす — extend a deadline
• 日程を延ばす — postpone a schedule
• 髪を延ばす — grow one’s hair long
• More
• 延ばしたい — want to extend / 〜たい form
• 延ばそう — let’s extend / 〜よう form
• 延ばしている — is extending; is postponing / state

延ばす（のばす） is a godan transitive verb. It means to actively make something longer or to delay something intentionally.