A. the oldest / the most expensive
Box A is bigger than Box B.
Box A is bigger than all the other boxes.
Box A is the biggest box.
The Europa Hotel is more expensive than the Grand.
The Europa Hotel is more expensive than all the other hotels in the town.
The Europa Hotel is the most expensive hotel in the town.
bigger / older / more expensive etc. are comparative forms (→ Unit 86).
biggest / oldest / most expensive etc. are superlative forms.
The superlative form is -est (oldest) or most ... (most expensive).
B. the -est / the most ...
Short words (old/cheap/nice etc.) → the -est:
• old → the oldest
• cheap → the cheapest
• nice → the nicest
• but good → the best
• bad → the worst
Spelling (→ Appendix 5): big → the biggest, hot → the hottest
Words ending in -y (easy/heavy etc.) → the -iest:
• easy → the easiest
• heavy → the heaviest
• pretty → the prettiest
Long words (careful/expensive/interesting etc.) → the most ...:
• careful → the most careful
• expensive → the most expensive
• interesting → the most interesting
C. We say: the oldest ... / the most expensive ... etc. (with the):
• The church is very old. It’s the oldest building in the town.
(= it is older than all the other buildings)
• What is the longest river in the world?
• Money is important but it isn’t the most important thing in life.
• Excuse me, where is the nearest bank?
D. You can use the oldest / the best / the most expensive etc. without a noun:
• Ken is a good player but he isn’t the best in the team.
(the best = the best player)
E. superlative + I've ever ... / you've ever ... etc.
• The film was very bad. I think it’s the worst film I’ve ever seen.
• What is the most unusual thing you’ve ever done?
-est superlatives
old → the oldest
cheap → the cheapest
nice → the nicest
good → the best
bad → the worst
the most ... superlatives
careful → the most careful
expensive → the most expensive
interesting → the most interesting
With "the"
the oldest building in the town
the longest river in the world