Теория:
Study some exceptions for adjectives.
Запомните прилагательные, степени сравнения которых образуются не по правилу.
• Good – better – the best
• Bad – worse – the worst
• Little – less – the least
• Many/much – more – the most
• Old – elder – the eldest (когда говорим о членах семьи)
• Far – farther – the farthest
Examples:
The train ticket is the least expensive.
Travelling by plane is the best variant.

Рис. \(1\). Travelling by plane
Who is the eldest in your family?
Источники:
Рис. 1. Travelling by plane, 2019, https://pixabay.com/images/id-4516478/ Pixabay License CC0 Free for commercial use No attribution required