Put the adjective into comparative or superlative form. 1. My room is (clean/ cleaner/ the cleanest) room in our house.
2. The Empire State is a little (big/ bigger/ the biggest) than the Chrysler Building.
3. Japan is (expensive/ more expensive/ the most expensive) country in the world.
4. Maths is a bit (interesting/ more interesting/ the most interesting) for me that History.
5. Cars are much (fast/ faster/ the fastest) than bikes.
6. Our grandfather (old/ older/ the oldest) in our family.
7. These trousers are much (comfortable/ more comfortable/ the most comfortable) than those jeans.
8. This was (bad/ worse/ the worst) day in my life!

1. the cleanest

2. bigger

3. the most expensive

4. more interesting

5. faster

6. is the oldest

7. more comfortable

8. the worst

1. My room is the cleanest room in our home.

2. The Empere State is a little bigger than the Chrysler Building.

3. Japan is the most expensive country in the world.

4. Maths is a bit more interesthing for me than History.

5. Cars are much faster than bikes.

6. Our grandfather is the oldest in our family.

7. These trousers are much more comfortable than those jeans.

8. This was the worst day in my life!

Короче, more ставится тогда, когда в слове больше 1 - го слога ( хотя в английском языке нету понятие СЛОГИ, просто в звучание должно быть больше 1 слога ). А вот когда 1 слог, то тогда ставится er или eir (если слово оканчивается на -y.

Most тоже ставится по тому же принципу. Но в Superlatives всегда ставится the перед глаголом или частицы. Без него предложение является грамматически не правильным.