Choose the best option to transform into a 'negative' sentence
I was doubtful whether I would pass the mid-semester examinations.
1
I was not sure if I would not pass the mid-semester examinations
2
I was not sure if I would pass the end-semester examinations
3
I was not sure if he would pass the mid-semester examinations
4
I was not sure if I would pass the mid-semester examinations.