Grammar fix
fully understand
completely understand
To understand something completely, with no confusion or missing information.
collocationB1common
Hear it in context
Notice where the phrase sounds natural.
- I fully understand the instructions, so I can start the project right away.communication
- In my opinion, it's important to fully understand the rules before you start a new job, because it helps you avoid mistakes.IELTS speaking
Fix the pattern
Pattern: fully understand + noun/wh-clause
WrongI don't fully understand about it.
RightI don't fully understand it.
'Understand' takes the object directly — no 'about'.
Patternfully understand + noun/wh-clause
Use it right
Choose the version that sounds natural in speech.
'Comprehend the matter in its entirety' is stiff; 'fully understand' is the natural phrase.
Build natural chunks
Words that usually travel with it.
fully understandIdon'tthe situationwhy
Don't confuse it
Stronger than just 'understand'—it means you have no doubts or confusion.