Question

Change the following sentence to passive voice.

Nobody can solve this problem.

• A. This problem is not solvable.
• B. This problem could not be solved.
• C. This problem cannot be solved by anyone.
  
• D. This problem will not be solved by anyone.

Answer 1

The correct option is C This problem cannot be solved by anyone.

A sentence is in active voice when the subject performs the action.
A sentence is in passive voice when the subject receives the action.
While converting a sentence from active to passive, the subject becomes the object and vice versa. When the active voice is in simple present form, passive voice takes the simple past form.
Subject + verb + object (active voice)

Therefore as per the rule option C is correct.

Option A and D are not in simple past form therefore incorrect. Whereas option B changes the meaning of the sentence, as the sentence is a generalized statement and does not refer to any specific set of subject. Therefore options A, B, D are incorrect.

Option C is the correct answer.