For example, "He knows that he's a lazy guy" or something like that.

Something along the lines of he/she is aware of something + the thing he/she is aware of.

  • Welcome to japanese.se, as a rule we don't do translations. If you can demonstrate you tried, then we can tell you whether you hit it or not... – virmaior Dec 15 '14 at 4:29

“He knows that A” is “彼はAを知っている” or “彼はAをわかっている”.

Your example is “彼は自分が怠け者であることをわかっている”. The second “he” is translated into “自分” because it means “himself”.

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