How can "He is going to quit his job" be expressed using "planning"?

The correct transformation uses "planning" to effectively convey the idea of someone preparing for a future action. The phrasing "He is planning to leave his job" indicates an intention that aligns closely with the original statement about quitting a job. This maintains the future aspect of the action while incorporating the word "planning," which emphasizes the preparatory nature of the decision.

This choice captures not just the intent to leave a job, but also the active decision-making process behind it. The phrase "planning to" suggests that the person has considered the action and is actively working towards it, which mirrors the meaning of "going to" in the original sentence.

Other options, while similar in meaning, may not use "planning" as fluidly or correctly in the context provided. For instance, "He plans to resign from his position" communicates intention but omits the active planning stage. The focus is more on the decision itself rather than the preparatory aspect. Similarly, "He is planning on quitting his job" uses a less formal structure and can sound more casual, while "He intends to quit his job" shifts the expression away from "planning" directly. Overall, the first option best encapsulates the preparation and intention associated with quitting a job.