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What is the different between "that and which"?

For learning: English
Base language: English
Category: Other



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    Here in the United States, many teachers tell us to use "that" for defining clauses. That is, when the information is absolutely necessary:

    I want the book THAT has the red cover (not the blue cover).

    They tell us to use "which" for non-defining clauses. That is, information that may be helpful, but is not absolutely necessary. The commas show that the information can be omitted without any problem:

    Sacramento, which is the capital of my state, is very beautiful.

    IMPORTANT NOTE: For many English speakers outside the United States, they have NO problem in saying "I want the book WHICH has the red cover."

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