Choose the correct form of the adjective in the brackets : 1. This is (big) building in the world. a)the biggest; b)the bigger; c)bigger; d)biggest; e)the most big. 2. I thought she was (young) than me. a)the younger; b)the youngest; c)the most young; d)younger; e)youngest. 3. The 5this Beethoven's (popular) symphony. a)popularest; b)the most popular; c)most popular; d)more popular; e)the more popular. 4. The Pacific is (deep) ocean. a)most deep; b)the most deep; c)the deeper; d)deeper; e)the deepest. 5. It is (hot) here than in London. a) hotter; b)the hottest; c) more hot; d)the hotter; e)the more hot.Choose the correct form of the adjective in the brackets : 1. This is (big) building in the world. a)the biggest; b)the bigger; c)bigger; d)biggest; e)the most big. 2. I thought she was (young) than me. a)the younger; b)the youngest; c)the most young; d)younger; e)youngest. 3. The 5this Beethoven's (popular) symphony. a)popularest; b)the most popular; c)most popular; d)more popular; e)the more popular. 4. The Pacific is (deep) ocean. a)most deep; b)the most deep; c)the deeper; d)deeper; e)the deepest. 5. It is (hot) here than in London. a) hotter; b)the hottest; c) more hot; d)the hotter; e)the more hot.​

1. This is the biggest building in the world. The correct form of the adjective is "the biggest." We use the superlative form of the adjective because we are comparing the building to all other buildings in the world.

2. I thought she was younger than me. The correct form of the adjective is "younger." We use the comparative form of the adjective because we are comparing her age to mine.

3. The 5th is Beethoven's most popular symphony. The correct form of the adjective is "most popular." We use the superlative form of the adjective because we are comparing this symphony to all of Beethoven's other symphonies.

4. The Pacific is the deepest ocean. The correct form of the adjective is "the deepest." We use the superlative form of the adjective because we are comparing the Pacific Ocean to all other oceans.

5. It is hotter here than in London. The correct form of the adjective is "hotter." We use the comparative form of the adjective because we are comparing the temperature here to the temperature in London.

In summary, when choosing the correct form of an adjective, we need to consider whether we are comparing something to others (superlative) or comparing two things (comparative). The correct form of the adjective will then depend on the specific situation and the rules of comparative and superlative forms.