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That vs. Which

04 Jul 2008 on learning

When to use that and when to use which?

That introduces a restrictive clause, which is critical to understanding the sentence because the clause defines its antecedent. E.g. The brown house that has a rooftop is my favourite.

Which introduces nonrestrictive clause, which include information relevant but not critical to an understanding of the sentence. E.g. The brown house, which has a rooftop, is my favourite.

Some links on the use of that _and _which: