Grammar fix
a crucial role
play/have a crucial role (in something)
to be an extremely important or decisive part of a situation, process, or outcome; to have a major influence on what happens.
Hear it in context
Notice where the phrase sounds natural.
- Parents play a crucial role in shaping their children's values and attitudes.daily life
- In my opinion, government support plays a crucial role in improving public health, because without sufficient funding, many essential services would not be available.IELTS speaking
Fix the pattern
Pattern: play/have a crucial role (in + noun/gerund)
WrongShe has a crucial role for the team's success.
RightShe plays a crucial role in the team's success.
You 'play a crucial role IN' something — not 'for'.
Patternplay/have a crucial role (in + noun/gerund)
Use it right
Choose the version that sounds natural in speech.
'Play a crucial role' is the natural collocation; 'fulfil an indispensable function' is bureaucratic.
Build natural chunks
Words that usually travel with it.
play a crucial role + ina crucial rolea key rolein the processa vital role
Don't confuse it
At B1/B2, learners may use 'an important role' or 'a big part', but 'a crucial role' is more emphatic and suggests that without this person or thing, the outcome would be very different.