I think (that)...
I think you should go now.
My view is (that)...
My view is that the project will fail.
In my opinion, ...
In my opinion, the firm can succeed.
I can assure you (that)...
I can assure you that we've done everything we can.
The fact is (that)...
The fact is, he's a great performer.
The point is (that)...
The point is, we don't know if they're being honest.
You're missing the point
You're missing the point - why do you never listen properly to what I'm saying?
Look, everyone thinks it's a bad idea.