Answer:
1. This is <em><u>the biggest building</u></em> in the world.
2. This is <em><u>the most comfortable</u></em> chair here.
3. He bought <em><u>the most expensive</u></em> flowers in the shop.
4. I think she's <em><u>the best singer</u></em> of the group.
5. He's <em><u>the most careful</u></em> driver of the company.
6. Who's <em><u>the oldest student</u></em> in the class?
7. It's <u><em>the worst film</em></u> I've ever seen.
8. She's <em><u>the most intelligent</u></em> of all the students.
Explanation:
The superlative form is when three or more things are compared. This form of adjective describes the lowest or the highest form of the group. It is identified by the use of the suffix '-est' or the addition of the word "most" before the adjective. In some cases, the adjectives change to the simple V3 form.
1. This is <em><u>the biggest building</u></em> in the world.
2. This is <em><u>the most comfortable</u></em> chair here.
3. He bought <em><u>the most expensive</u></em> flowers in the shop.
4. I think she's <em><u>the best singer</u></em> of the group.
5. He's <em><u>the most careful</u></em> driver of the company.
6. Who's <em><u>the oldest student</u></em> in the class?
7. It's <u><em>the worst film</em></u> I've ever seen.
8. She's <em><u>the most intelligent</u></em> of all the students.