3. big tall nice good long easy young hot bigger biggest taller tallest nicer nicest better best longer longest easier easiest younger youngest hotter hottest

4. The dog is bigger than the mouse. The horse is the biggest of all. The boy is younger than the man. The baby is the youngest of the three. big bigger biggest young youngeryoungest

5. JimLi Lei Tom Li Lei is taller than Tom.Jim is the tallest of all. ￥ 30 ￥ 20 ￥ 10 The yellow coat is cheaper than the purple one. The brown coat is the cheapest of the three.

6. The dog is bigger than the mouse The boy is younger than the man. Li Lei is taller than Tom. The yellow coat is cheaper than the purple one. A + be + 比较级 + than +B 形容词比较级句式的结构：

7. The horse is the biggest of all. The baby is the youngest of the three. The brown coat is the cheapest. Jim is the tallest in our class. 主语 + be + the + 最高级 + of / in….. 形容词最高级句式的结构：

8. ￥ 30 ￥ 20 ￥ 10 TomLi Lei Jim young cheap tall

9. pumpkin 南瓜 Why does Lucy want to buy a pumpkin? Lucy

10. Jim is strong. Li Lei is. Tom is. stronger the strongest

11. The blue car is nice. The red car the blue car.( 红车比蓝车好看） The colour car of all. （彩色车最好看） is nicer than is the nicest