Correct word usage - Which/that/Who

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Been writing essays, and was stuck with when to use which/that/who - this is what I found - hope this helps ^^
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[i]who/which/that [/i]
L.J I$Dlp!B'a Always use who when referring to people. Use which or that when referring toanimals, things, concepts, or groups. (For an explanation of how to decidebetween using which or that, see [url=http://www.northeastern.edu/toolkit11/messaging/style9.html]section9.1.3[/url].)
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[i]The new computer parts, which were just delivered, are the wrong size. [/i]-N"pb5tZD
[i]The soccer team that usually makes it to the national championships didn'tqualify this year.[/i][/i]