Explanation: Second Conditional এর নিয়মানুযায়ী,
If + subject + were + comma = subject + would/could/might + verb এর present form + extension.
সুতরাং, নিয়মানুযায়ী সঠিক উত্তর - I would fly in the sky.
Complete Sentence: If I were a bird, I would fly in the sky.