“不用谢”是“you're welcome”还是“you're welcomed

After someone thanks you, the correct phrase is “you’re welcome,” not “you’re welcomed.” In the previous example, welcome is used as an adjective. Welcome can also serve as a verb (We welcome the summer!) or as an interjection (Welcome!), usually stated when greeting someone.

Welcome as an Adjective
As an adjective, welcome means wanted, appreciated, or pleasing.

You are welcome to stop by.

You should speak up more; your thoughts are welcome.

In the phrase “you’re welcome,” which is what you say when someone thanks you, “welcome” is an adjective.

Welcome as a Verb
When used as a verb, welcome keeps the same meaning; to welcome something means to greet it or to receive or accept it with pleasure.

We were welcomed into the home by all three kids and the family dog.

We welcomed the rain but not the mud it left behind.

I would welcome your advice on this matter.

Welcome as an Interjection
Interjections are words we use to express surprise, anger, or other types of emotions. Welcome can be interjection if you use it to greet a guest. You use it the same way you’d use “hello.” The difference is that “hello” is neutral and “welcome” is warm and inviting.