comparative in Arabic language
Is there a pattern?
1. good - better
2. expensive - more expensive
3. hot - hotter

Question

Answer

1. جيد - أفضل.
2. مكلف أو غالٍ - أكثر تكلفة أو أكثر غلاءً.
3. حار - أكثر حرارة.

I hope that i have helped you :)

Answer

well, in Arabic you can see the normal weight of any comparative verb as 
أفعل

Example:

جيد => أجود
حسن => أحسن

both mean good => better

غالى => أغلى
expensive => more expensive

حار => أحرّ
hot => hotter

This is the normal case when you dealing with any comparative verbs

However, If the infinitive of the verb is more than order three, then you can use another comparative like "أكثر" or "أشدّ" + infinitive

Example:

جيد => أكثر جودة
حار => أشد حرارة

and so on

Answer

good: جيد /حسن
better: أحسن / أفضل

expensive: غالي
more expensive: أغلى

hot: حار 
hotter: أشد حرارة

Answer

good: جيد
better:   أحسن / أفضل

expensive: غالي
more expensive: جد غالي

hot: حار 
hotter: جد حار