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Sentence improvement: modal perfect form with “should” (should + not + have + past participle) Original sentence: "He should not had done it." Choose the correct modal construction.

Difficulty: Easy

had not
should had not
should not have
should have
No correction required

Correct Answer: should not have

Explanation:

Concept
The correct form after a modal is always the base infinitive, so the past counterfactual uses should not have + past participle: "should not have done".

Option analysis
should not have — correct sequence with "done" implied. ✅had not / should had not — misuse of "had" after a modal.should have — lacks "not"; changes meaning.

Final Answer
should not have (done it).

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