<p>The time and the place for such a large event are subject to the approval of the mayor's office.</p>
<p>a) The time and place for such a large event are subject to be approved by the office of the mayor.</p>
<p>What makes A wrong and the first sentence correct? In the first sentence, to me it doesn't sound right because it sounds as if they are approving the "mayor's office" and not the "time and the place".</p>