Is there a generic formula to express "to know how to do something"?
I know how to ask a question in the second person "How do you do something?", e.g.
How do you write "Yasuda" in kanji? 「やすだ」は漢字でどう書きますか。
I also know how to ask
Can he write "Yasuda" in kanji? 彼は「やすだ」を漢字で書けますか。
but I am struggling to put it in the third person:
Does he know how to write "Yasuda" in kanji?