a better car,the best car
a worse report,the worst report
a more reliable person,the most reliable person
a bigger book,the biggest book
a more interesting book,the most interesting book
a more expensive restaurant,the most expensive restaurant
a tidier room,the tidiest room
a more powerful person,the most powerful person
a more exciting film,the most exciting film
当形容词或副词是多音节,也就是2个以上音节时,变比较级直接在前面加上more,变最高级直接加the most.