1、welcome用作形容词时，其基本义为受欢迎的。
2、用于习语You are welcome。意为不用谢。
3、用作动词，welcome 表示欢迎时，是规则动词。搭配be welcome to （do） sth。
例句AThank you for your help. 谢谢你的帮助。BYou are welcome. 不用谢。AThank you very much for carrying the luggage for me. 非常感谢你帮我拿行李。BYou are welcome. It was the least I could do. 不用客气，区区小事，何足挂齿。
