Posted by John on Thursday, July 9, 2009 at 5:23pm.
1. The word "when" is a subordinating conjunction. It introduces the subordinate clause ("when he would come back"). [The main clause is "I knew."]
http://grammar.ccc.commnet.edu/grammar/conjunctions.htm#subordinating_conjunctions
2. Yes. It introduces the clause "when he would come back" which is serving as an adjective -- the whole clause modifies the word "time."
http://owl.english.purdue.edu/owl/resource/645/01/
3. No -- see #1 above.
4. See #2 above. It's the same construction even though the words are slightly different.
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