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**.
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How to say "he/she knows"?
“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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