Know in (1) refers to the clause that comes right before it, so there's no pronoun necessary -- it's essentially a transform of I know it's your job. In (2), however, the object of know is not indicated, as you point out, so something must be provided.
BroadwayWorld: All I Really Need To Know I Learned In Kindergarten at Brandon Town Hall
All I Really Need To Know I Learned In Kindergarten at Brandon Town Hall
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From Middle English ever, from Old English ǣfre, originally a phrase whose first element undoubtedly consists of Old English ā (“ever, always”) + in (“in”) + an element possibly from feorh (“life, existence”) (dative fēore).
Definitions of ever adverb at all times; all the time and on every occasion “ ever hoping to strike it rich” “ ever busy” synonyms: always, e'er see more
Ever is used in negative sentences, questions, and comparisons to mean 'at any time in the past' or 'at any time in the future'. Neither of us had ever skied. I don't think I'll ever be homesick here. Have you ever played football? I'm happier than I've ever been.
(used to mean "at any time'' in questions, in sentences with negative words, with words expressing a condition, like if, with words expressing uncertainty, like doubt, and after a comparative adjective with than): Did you ever go skiing? I hardly ever drink soda. If you ever see him, tell him to call me. I doubt that I'll ever see her again.