Explanation: In English grammar, adjectives are used to describe nouns and can be modified to express different degrees of comparison. The three degrees of comparison are positive, comparative, and superlative.
1. **Positive Degree**: This is the basic form of the adjective used to describe a noun without making any comparison. For example, "Kolkata is big." Here, "big" is used in its positive degree to describe Kolkata.
2. **Comparative Degree**: This form is used to compare two entities. It is typically formed by adding "-er" to the end of the adjective or by using "more" before the adjective. For example, "Kolkata is bigger than Mumbai." Here, "bigger" is the comparative form of "big," used to compare Kolkata and Mumbai.
3. **Superlative Degree**: This form is used to compare more than two entities. It is typically formed by adding "-est" to the end of the adjective or by using "the most" before the adjective. For example, "Kolkata is the biggest city in the state of West Bengal." Here, "biggest" is the superlative form of "big," used to compare Kolkata with all other cities in West Bengal.
In the given sentence, "No other city in India is so _____ as Kolkata," the context is a direct statement about Kolkata without any explicit comparison to other cities. Therefore, the positive form of the adjective "big" is appropriate. The sentence is emphasizing a characteristic of Kolkata without comparing it to other cities, making "big" the correct choice.
Understanding the correct use of adjectives in different degrees is crucial for clear and accurate communication in English. It is important to pay attention to the context of the sentence to determine which form of the adjective is appropriate.