如，i'd like to stay with my families in holiday.
in the holiday 指特定的假期，根據上文的延續。
如，Christmas is a spcial holiday in western countries. In the holiday, people usually stay with their families.
on holiday 處於放假的狀態
如，i'm on holiday now.類似有on duty 上班中
幫妳造了幾句話,妳可以通過理解句意來看區別,希望對妳有用
on the holiday:
A few more traveller's cheques may come in handy on the holiday.
多帶幾張旅行支票，度假時會有用的。
in the holiday:
we (enjoy ourselves) in the holidays.
In the holiday season one finds the trains unpleasantly full of people.
節日期間，人們可以看到火車上擁擠不堪，人滿為患。
如果妳前面曾經提起過某個節日，而現在針對這個節日說on，就要用on the holiday,特指在這個節日。否則，用on holiday.