1.- I'm  going to talk about ...

2.- I'm going to describe this picutre ...

3.- I think

4.- From my point of view ...

5.- In my opinion ...

6.- I'm totally sure because ...

7.- I'm not sure at all because ...

8.- I totally agree with you / I totally disagree with you / I don't agree with you

9.- There is / There are ...

10.- I can see ...

11.- On one hand... and / but On the other hand