Preguntar por la opinion

What do you think?

What is better for you …?

Do you think about …?

Don´t you think?

What about you?

What type of … do you like more? / prefer?

Dar opinión

I think that …

I believe that …

Estar de acuerdo o no:

You are right.

It´s true.

That´s true.

I agree with you.

Argumentar

I think it´s true because …

I don’t agree because …

I agree because …