Step 1: Understanding the Question:
The given sentence, "He is doing his job well", is in the present continuous tense, active voice. We need its passive form, and the passive must keep the same tense as the original, not switch to a different one.
Step 2: Key Formula or Approach:
The passive of the present continuous tense follows the pattern: subject + is/am/are + being + past participle (+ by + agent, if needed). This is different from the simple present passive, which drops "being" and uses subject + is/am/are + past participle.
Step 3: Detailed Explanation:
In the active sentence, "his job" is the object and "he" is the subject. In the passive, "his job" becomes the new subject.
Applying the present continuous passive formula: "his job" + "is being done" + "well" gives "His job is being done well." This keeps the same continuous, ongoing sense as the original active sentence.
Now check the four options against this rule. Option 1, "His job is done well by him", uses the simple present passive ("is done"), which describes a general habit or fact, not an action in progress right now, so it changes the meaning and tense of the original sentence.
Option 3, "He has been doing his job well", is not passive at all; it keeps "he" as the subject doing the action, so it is still active voice in the present perfect continuous tense.
Option 4, "His job is being well done", does use the correct continuous passive structure, but it places the adverb "well" awkwardly between "being" and "done". Standard English places a manner adverb like "well" after the past participle, giving "is being done well", not before it.
Option 2, "His job is being done well", correctly keeps the continuous aspect with "being done" and places "well" in its natural position right after the participle.
Step 4: Final Answer:
The most appropriate passive form is "His job is being done well."
\[ \boxed{\text{His job is being done well}} \]