I'm going to talk about...
I have been revising my notes and...
I had never thought of this...
I'm still getting used to speaking...
I'm already used to grammar...
I wonder what this is about...
I have always thought that...
I should have studied more...
I shouldn't have eaten so much...
I regret eating so much...
I might have overindulged a bit...
I put up over two kilos...
I should cut down on desserts now...
By the end of this test I will have impressed you with my English
To conclude
In a nutshell