1. Have you noticed anything strange?
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Well done! This is the correct answer. Present perfect changes to past perfect. When the original question does not have a Question world (when, where, what, why, etc.), we use IF at the beginning of the reported form, and then an affirmative sentence.
Incorrect! This is not the correct answer. You need to change the question in Present Perfect (have+subject+verb in past participle) to an affirmative Past Perfect (subject+had+verb in past participle).
Incorrect! This is not the correct answer. You need to change the question in Present Perfect (have+subject+verb in past participle) to an affirmative Past Perfect (subject+had+verb in past participle).