1. She is talking to the boy named/called Pooh in Seoul at a chatroom.
2. She is talking to a boy named/called Pooh in Seoul at a chatroom.
(Are both grammatical? Which one is right? Do we ahve to use 'a' or 'the'?)
NO 2 IS CORRECT AND YOU USE A.
Both sentences are grammatically correct, but they have slightly different meanings. The choice between using "a" or "the" depends on the specific context you want to convey.
1. "She is talking to the boy named/called Pooh in Seoul at a chatroom."
In this sentence, the use of "the" implies that there is a specific boy named Pooh that the speaker is referring to. It suggests that the speaker and the listener are already aware of this boy and his identity. For example, if the context was already established that there is a group of boys in Seoul, and the one named Pooh is known to both the speaker and the listener, then using "the" would be appropriate.
2. "She is talking to a boy named/called Pooh in Seoul at a chatroom."
Here, the use of "a" implies that the speaker is mentioning a boy named Pooh for the first time, without assuming prior knowledge or presuppositions about his identity. It suggests that the speaker is encountering this boy's name for the first time and is simply referring to him as "a boy named Pooh."
In conclusion, both sentences are grammatical, but the choice between "a" and "the" depends on the context and the prior knowledge shared between the speaker and the listener.