Usage patterns
事前に〈動詞〉to do something in advance
It's better to make a reservation in advance.
事前の〈物〉prior ~; ~ made or done beforehand
Prior preparation is essential for this project.
事前に〈事〉を確認するto check something in advance
Please check the contract details in advance.
事前に〈人〉に知らせるto inform someone in advance
If there are changes, employees should be informed beforehand.