You write ( clearly) than your friend
More clearly
She smiled (happily) than before.
More happily
He works ( hard) than before
Harder
I speak English (fluently) now than last year
More fluently
Our team played ( badly) of all
Worst
This girl dances (gracefully) of all
Most gracefully
Jim can run (fast) than Tim
Faster
Planes can fly ( high) than birds
Higher
She greeted me (politely) of all
most politely
Now he drives ( carefully) than before
More carefully