出国前掌握以下英语词汇和表达可以帮助你更好地适应和交流:1. 基本问候语和礼节用语:如hello, hi, thank you, please, excuse me, sorry等。2. 自我介绍:如My name is...,I come from...,I am a student/worker等。3. 交通出行相关:如take a taxi/bus/train/plane, go straight, turn left/right, traffic light等。4. 购物相关:如how much is it, I want to buy..., where is the nearest...等。5. 餐饮相关:如restaurant, menu, order, bill, tip等。6. 住宿相关:如hotel, room, reservation, check-in/check-out等。7. 紧急情况相关:如call the police/ambulance, help, danger, emergency等。8. 时间和日期相关:如what time is it, today/tomorrow/yesterday, Monday/Tuesday/Wednesday等。9. 景点和文化相关:如museum, art gallery, historic site, local customs等。以上是一些常见的英语词汇和表达,如果你能够掌握并运用自如,会对你在国外的生活和交际带来很大帮助。同时,也建议多听、多说、多练习,提高自己的英语水平。