Grammar Rules: That versus Which

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"That" is used when essential information follows.

"Which" is used when non-essential information.

The rules are a little more complicated, but those are the basics.

Examples:

THAT

  • Funding is used to help companies that have been approved by the government.
  • The file cabinets hold IRS returns that have been filed.

WHICH

  • Non-fiction books are on the back shelf, which is a bit of a walk from here.
  • Retrievers are touted as being the best dogs around children, which is better for your needs.

By the way, "Who" refers to people. "That" and "which" refer to things, so don't use "that" when referring to people.
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