IpseDixit wrote:linguoboy wrote:What about it?
Can I use it in place of this/that?
You mean, can you say, "I agree with it" to show agreement with something someone has just posted?
It is absolutely unidiomatic and a clear sign of being a non-native speaker. You need a clear antecedent before you can use "it". For instance:
"What do you think of this article?"
"I'm not sure I agree with it, but it was an interesting read."
"It" refers back to "this article". But if someone just posted the article, you'd need to use a demonstrative.
"Richmond is a real scholar; Owen just learns languages because he can't bear not to know what other people are saying."--Margaret Lattimore on her two sons