Posted by rfvv on Sunday, December 5, 2010 at 5:17pm.
http://www.answers.com/that
As you can see, "that" can be a pronoun, an adjective, an adverb, a conjunction.
In this case, you are using "that" as a subordinating conjunction:
http://grammar.ccc.commnet.edu/grammar/conjunctions.htm#subordinating_conjunctions
#3 is correct.
#4 is correct with "that" but awkward with "when."
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