1. what do you think?
2. i think this is really great / i think it's ok / i'm sorry but i think it's bad
Asking someone opinion

-Have you got any comments on the situation?
-Do you have any idea?
-Do you have any opinion on the situation?
-would you give me your opinion on the situation?
-What is your opinion about the homework?

giving opinion

-I think i like it!
-I don't think I care for it
-That's really good
-I think that is nice
-I don't think much of it.

Appreciate someone
- you've done your homework greatly.. well done.. I really appreciate it.
- Great job.. i appreciate that.
-That's great..
- Your work is great. i really appreciate it.
-You're really nice..