Question

4.my pen is not more costly than your pen (interchange of degree of comparison)
5. Calcutta is the biggest city in India (interchange of degree of comparison)
6. Sardar Patel was the greatest leader of his time (interchange of degree of comparison)

Answer 1

Explanation:

4.my pen is not costlier than your pen.

5.Calcutta is a city in India.

6.Sardar Patel was a great leader of his time.

Answer 2

Answer:

1 your pen is costlier than my.

2 no other city is bigger than Calcutta in India.

3 no other leader was greater than sardar patel in his time.