I'm an English learner.
I wanted to know which one is correct.
I like the girl who lives next door.
I like the girl whom lives next door.
For me I know I can separate the sentence into two sentences. Such as
I like the girl.(the girl is an object)
The girl lives next door.(the girl is a subject)
I think
I like the girl who lives next door
This one is the correct answer.
But someone tells me
I like the girl whom lives next door
It's also correct in old-fashioned English.
But for me,
I think the old-fashioned English is only used in the below situation.
I like the girl.(the girl is an object)
You met the girl last night.(the girl is an object.)
I like the girl whom you met last night. I like the girl who you met last night.
Both of them are correct.
When "the girl" is an object in the second sentence. It can meet the old-fashioned English rule.
But when "the girl" is a subject in the second sentence. It can't meet the old-fashioned English rule.
So I wanted to know if the sentence, I like the girl whom lives next door, is the correct sentence?