Which would you use?

[Bridget]

"You need an English teacher who/whom you have confidence in."

[Rusty]

"You need an English teacher who/whom you have confidence in."
I think most people would avoid the who/whom question and say "...that you have confidence in."

[Lucretia]

Hello,
I think who is better; whom is formal and as it is such, it would have a different word order - in whom.

[Bridget]

I think most people would avoid the who/whom question and say "...that you have confidence in."

Would that be a reduced relative clause, Rusty?

[Rusty]

Would that be a reduced relative clause, Rusty?
No, a reduced relative clause omits the relative pronoun. I changed who/whom to that. That may be used in reference to a person in standard American English. Source (http://www.bartleby.com/68/92/5992.html). In traditional English grammar the sentence would be: "You need an English teacher in whom you have confidence."