- Step 1: Analyze subject-verb agreement. "He" is singular, third person, requiring "has" for present perfect tense.
- Step 2: Check verb form. Present perfect tense requires "has" + past participle ("finished").
- Step 3: Evaluate options. Option (1) uses "have," incorrect for third-person singular. Option (2) uses "has finish," incorrect verb form. Option (3) uses "has finished," correct. Option (4) uses "have finish," incorrect for both verb and form.
- Step 4: Verify. "He has finished" follows standard grammar for present perfect tense.
- Step 5: Conclusion. Option (3) is correct.