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Friday, 12 August 2011

Research Writing: That or Which?

Very simple explanation on "that" and "which". But I would say- this one is the best clarification I found on the web so far. I am confident enough now to use either of the two as the papers I review mostly mix up them.

[Originally from Mignon Fogarty]

Restrictive Clause--That

A restrictive clause is just part of a sentence that you can't get rid of because it specifically restricts some other part of the sentence. Here's an example:

Gems that sparkle often elicit forgiveness.

The words that sparkle restrict the kind of gems you're talking about. Without them, the meaning of the sentence would change. Without them, you'd be saying that all gems elicit forgiveness, not just the gems that sparkle. (And note that you don't need commas around the words that sparkle).

Nonrestrictive Clause--Which

A nonrestrictive clause is something that can be left off without changing the meaning of the sentence. You can think of a nonrestrictive clause as simply additional information. Here's an example:

Diamonds, which are expensive, often elicit forgiveness.

Leaving out the words which are expensive doesn't change the meaning of the sentence. (Also note that the phrase is surrounded by commas. Nonrestrictive clauses are usually surrounded by, or preceded by, commas.

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