Change the following from active to passive:
Someone must have tampered with the encryption keys.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. The encryption keys must have been tampered with.
About the given sentence:
Type of sentence: Assertive Tense: Present Perfect (with modal must) Given voice: Active voice Subject: Someone Object: The encryption keys
Structure for conversion:
Active: Subject + must have + verb (IIIrd form) + object... Passive: Object + must have been + verb (IIIrd form) + by + subject...
Converted sentence: The encryption keys must have been tampered with.
Hence, the chosen option is correct.