Interchange of Affirmative and Negative Sentences

1. Brutus loved Caesar.
Brutus was not without love for Caesar.
2. I was doubtful whether it was you.
I was not sure that it was you.
3. Old fools surpass all other fools in folly.
There's no fool like an old fool.
4. He is greater than me.
I am not so great as him.
5. Alfred was the best king that ever reigned in England.
No other king as good as Alfred ever reigned in England.