急急急，求英语高手
最近一直很😖纠结welcome,welcome to到底welcome是感叹词还形容词?有些人又说是省略了you are所以是形容词，有些人又说是感叹词。而welcome back to sp我更纠结，这里的welcome又是什么词?是动词的话应是及物动词又不能加to，是形容词back能修饰吗?是感叹词感觉又不对啊，到底是什么啊?那back到底又能修饰什么词啊?不可能是省略了to做宾语吧,因为副词不能做宾语吧
[VERB]If you welcome someone, you greet themin a friendly way when they arrive somewhere.
[V n]Several people came by to welcome me...
[V n adv/prep]She was there to welcome him home from war...
[V-ing]The delegates received a welcoming speech by the President.
加to 和back那是习惯用语，不用纠结
追问welcome to中welcome是什么词啊?动词难道可以放句首吗?是祁使句?
?
追答也可做形容词。这里是固定用法，不必深究
[ADJ-GRADED: usu v-link ADJ]If you say that someone is welcome in a particular place, you are encouraging them to go there by telling them that they will be liked and accepted.
New members are always welcome...
I told him he wasn't welcome in my home.