Example Asking and giving opinion.

• Asking opinion.

1. Do you think it will rain ?
2. Do you think that today is too hot?
3. What do you think of this T-Shirt?

• Giving opinion. 

1. I think so.
2. I go with your opinion.
3. I think that T-Shirt is very nice.

• Disagreeing with someone opinion.

1. I can't say anything.
2. I don't think so.
3. It's good idea, but ...