London is ... than Glasgow.(busy)
busier
Susan's hair is ... than my hair. (long)
longer
The blue car is ... than the black car. (nice)
nicer
Lucy is ... than Ellie.(old)
older
George is ... than Robert. (funny)
funnier
Jake's room is ... than Larry's room. (small)
smaller
Julie is ... than her sister. (quiet)
quieter
Christine is ... than Alice. (smart)
smarter