Formal:
* "Whilst" is a more formal synonym for "while."
* "Whilst" is often used in British English and academic writing.
* Example: "Whilst I understand your concerns, I believe this solution is the best option."
Informal:
* "Whilst" can be used in informal writing, but it's less common.
* Example: "I'm going to the store whilst you're cleaning."
Key points:
* "Whilst" always introduces a subordinate clause (a clause that depends on another clause for meaning).
* You can often replace "whilst" with "while" without changing the meaning.
* "Whilst" is more common in British English than American English.
Let me know if you'd like to see more examples, or if you have any other questions!