How to say know-it-all in Japanese

Example Sentences

知らないshiranai。: I don't know.
何とnanito 言ったらittara 良いyoi かka 分かりませんwakarimasen。: I don't know what I should say.
何とnanito 言ったらittara いいii かka・・・。: What should I say?
時間jikan がga あるaru かka 分かりませんwakarimasen。: I don't know if there is time.
もしmoshi 誰dare かka にni このkono 話hanashi のno 要点youten はha 何nani かka ってtte 尋ねtazune られrare てte もmo 私watashi はha さっぱりsappari わからwakara ないnai わwa。: If anyone was to ask what the point of the story is, I really don't know.

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