The harder you work, the more you achieve (C1 Grammar)

Use this pattern to link two things that rise or fall together: change one and the other changes in proportion. FORM: the + a comparing word at the front of each of two halves — the + comparing word + clause, the + comparing word + clause. For short words the comparing word takes -er (the harder, the sooner, the older); for the falling direction use the less or the fewer. Keep the in front of both halves. It is a compact, emphatic pattern — reach for it in advice, argument and headlines when you want the link between the two changes to feel inevitable.

Two things changing together: the ... , the ...

Longer words: the more / the less

For longer words that do not take -er, put the more or the less in front of the whole word: the more expensive, the less complicated. The more goes with anything, countable or not (the more time, the more mistakes). It is the falling direction that splits: careful writing uses the fewer for things you can count (the fewer errors) and the less for things you cannot (the less time), though you will hear the less with countable things in speech. Never combine more with an -er word — pick one way of comparing, not both. This is the plain, explanatory version of the pattern; use it when you want the two changes spelled out clearly rather than clipped.

Keep normal order after each half

In the full form, each half is a clause in normal statement order — subject + verb, just like an ordinary sentence — after the the + comparing word. Don't swap them into question order. So each half is the + comparing word + subject + verb, and this is the fully spelled-out version you will use in most speaking and everyday writing. (In heavier formal prose you may come across the verb be moved in front of a long subject in the second half — "the greater the pressure, the more rapid is the response" — but that is an optional flourish, never something you have to do.)

Reduced and clipped forms (formal / emphatic)

In formal, literary or punchy writing you can drop the verb — usually be — to make each half shorter and sharper: The more expensive the hotel, the better the service (= the more expensive the hotel is, the better the service is). The fixed saying the sooner, the better strips it right down to the two comparing words. Reach for the reduced form when you want a crisp, proverb-like, emphatic effect — in slogans, aphorisms and formal prose; keep the full subject-verb clause for ordinary explanation. When you drop be, don't reinsert it in inverted order: the noun simply follows the comparing phrase.