Rule 1.
Who refers to people. That and which refer to groups or things.
Rule 2.
That introduces essential clauses while which introduces nonessential clauses.
Rule 3.
If this, that, these, or those has already introduced an essential clause, you may use which to introduce the next clause, whether it is essential or nonessential.
Thanks for the post. I had never thoght about the rule for that vs. Which. It makes a lot of sense now.
ReplyDeleteI for one struggle with keeping these rules right in my writing. Thanks for doing a grammar post about it. You made it well organized with precise thoughts which make it easy to read.
ReplyDeleteGreat Job! :)