Several different grammatical structures are used for comparing. English adjectives and adverbs can be in positive, comparative or superlative forms. Positive adjectives can be used to say that people or things are equal or unequal in a particular way.
Comparative adjectives and adverbs are used to say that people or things are unequal in a particular way.
Answers
1. It is more expensive than I thought.
2. Chennai is hotter than Mumbai.
3. Susie is the prettier of the two sisters.
4. Mary is the best student in the class.
5. He is not as successful as his brother.
6. The car is running smoothly / more smoothly since it had a service.
7. It was the most expensive dress I have ever worn.
8. It was ten times more difficult than I expected.
9. I can walk three times further than / three times as much as you.
10. He is twice as lively as his brother.
11. He explained it carefully, but I was still none the wiser.
12. The more information that comes in, the more confused the picture is.
