Ivan : I'd like Pig Cafe
Jenny : It is more expensive than Blue Cafe. It is dirtier too. There is rubbish on the ground all the time.
Mum : I don't like Pig Cafe. It's also noisier. The music is always very loud.
Ivan : But I want to have steaks.
Dad : That food is not healthy. The food at Blue Cafe is more delicious and healthier than that of Golden Restaurant.
為什麼dirty要用dirtier,它都沒有和別的比較?
為什麼noisy要用noisier它都沒有和別的比較?
為什麼healthier than後要用that?