Select the correct passive form of the given sentence. Do not allow strangers…

Solution

Correct sentence: Strangers should not be allowed into the society complex.

Key points

• The original sentence is an imperative negative instruction: "Do not allow strangers into the society complex." The subject (the person instructed) is implicit ('you').

• To form the passive of an instruction or suggestion, the object becomes the subject and a modal construction is used for suggestions: should + be + past participle.

• Apply the steps:

  • 1. Make the object 'strangers' the subject of the passive sentence.

  • 2. Use the modal passive for suggestion: 'should be' plus the past participle 'allowed'.

  • 3. Place the negation before the main verb: 'should not be allowed.'

Why the other choices are incorrect

• "Let strangers must not allow into the society complex." is ungrammatical because combining 'let' and 'must' this way is incorrect and it does not form a passive construction.

• "Strangers should not have been allowed into the society complex." uses the perfect passive ('should have been allowed'), which refers to past events or regret and is not the correct form for a present instruction or suggestion.

• "Let strangers should be not allowed into the society complex." is incorrect because 'Let' is unnecessary and the negation is in the wrong position; the natural form is 'should not be allowed'.

Summary: Transform the object into the subject, use the modal passive 'should be' with the past participle 'allowed', and place 'not' before 'be' to get the correct passive instruction.