Небольшая подборка полезных фраз, которые понадобятся если вам придется выражать собственное мнение на английском:
I (really) feel that...
In my opinion...
The way I see things...
I tend to think that...
I believe that
As for me, I feel that
I consider
I suppose
I guess
I ‘m sure that
I’m confident about
To my mind
I agree with the point that