Langsung to the point ya :)
A: What your opinion about this class?
B:  In my opinion this class is very clean. What about you?
A: Sorry, I disagree about your opinion. I think this class is very dirty.

Seperti itu lah :D
Andi : What your opinion about my class?
Budi : My opinion, your class is very clean and tidy. What is your opinion about my class?
Andi : Oh Thankyou Budi. I'm sorry before it, but i think your class is dirty and a lot rubbish strewn
Budi : That's right. My friend is very naughty. Hmm, Thankyou Andi, but i must go home now! See you tomorrow!
Andi : Okay, me too! See you tomorrow!