5. Today the Sun shines more brightly than yesterday. 
Yesterday the sun didn't shine as brightly as today
6. I think a computer will be more helpful for you than a smartphone.
(HELPFUL)
I think a smartphone won't be as helpful as a computer.
7. I'm not as good a tennis player as Henry is. (BETTER)
Henry is a better tennis player than I am
8. He speaks more persuasively than his brother. (AN)
He is a more persuasive speaker than his brother.
9. Non-smokers usually live longer than smokers. (NOT)
Smokers do not usually live as long as non-smokers.
10. My sister writes more carefully than she did. (USED TO)
My sister used to write less carefully than she does now.