Fixed phrases
Groups of words that never change, like in the long run or by chance.

Some phrases are like blocks: the words always come in the same order, and you can't change any of them. We say by chance, never 'with chance', and on purpose, never 'for purpose'. Part 1 loves these phrases, because the wrong options look perfectly reasonable – unless you know the phrase.
Phrases with prepositions
Longer expressions
How it comes up in Part 1
In Part 1 you choose the word (A, B, C or D) that best fits each gap. The four options often have similar meanings, so knowing which words go together is what gets you the mark.
A advance B front C before D early
In advance means before the time. "In front" is about position.
A purpose B intention C aim D plan
On purpose means deliberately.
A run B time C way D road
In the long run is fixed.
Common mistakes
- ✗ We met for chance.✓ We met by chance.The phrase is by chance.
- ✗ He did it by purpose.✓ He did it on purpose.The phrase is on purpose.
- ✗ The machine is out of work.✓ The machine is out of order.Machines are out of order; people are out of work.
- ✗ Who is the charge of the team?✓ Who is in charge of the team?The phrase is be in charge of.

When a gap is inside a group of words that sounds 'fixed', say the whole phrase to yourself with each option. Keep a page in your notebook for fixed phrases – they appear again and again in Part 1.
Quick check
Choose the word that best fits each gap.
🇪🇸 Guía en español: Los 40 phrasal verbs más útiles para el B2 First →