2. The red carp, green carp and donkey of Lu family should compete with the red donkey, green donkey and carp of Lu family to see who is redder and greener.

3. Lu said his green carp was greener than Lu's, and Lee Hyo Ri said her green donkey was greener than Lu's.

4. I don't know whether the green carp of Lu family is greener than the green donkey of Lu family or the green donkey of Lu family is greener than the green carp of Lu family.

5. Green carp is better than green donkey, and green donkey is better than green carp.

6. Finally, Lu wants to exchange green carp for green donkeys, instead of green donkeys for Lu's green carp.

7. Red carp, green carp and donkey, red donkey and green donkey and carp. I don't know whether the green carp is greener than the green donkey or the green donkey is greener than the green carp.