The correct active form of "I was deceived by the stranger " is-

"The stranger deceived me" is the correct active form of "I was deceived by the stranger."

The original sentence is in the passive voice: "I was deceived by the stranger." In passive voice, the subject of the sentence (in this case, "I") is acted upon by the verb ("was deceived"), and the doer of the action (the stranger) is mentioned with "by the stranger."

To convert a passive voice sentence into an active voice sentence, you need to make the doer of the action the subject of the sentence. In this case, the doer of the action is "the stranger." So, "The stranger" becomes the subject in the active voice.

The past tense of "was deceived" is "deceived," so we use "deceived" in the active voice sentence. Therefore, "The stranger deceived me" is the correct active voice transformation of the original passive voice sentence.