Study some exceptions for adjectives.
Запам'ятай прикметники, які утворюють ступені порівняння не за правилом:
• Good – better – the best
• Bad – worse – the worst
• Little – less – the least
• Many/much – more – the most
• Old – elder – the eldest (коли говоримо про членів родини)
• Far – farther – the farthest
Examples:
The train ticket is the least expensive.
Travelling by plane is the best variant.
Who is the eldest in your family?
Джерела:
http://innonthedrive.com/traveling-by-car-plane-or-train