1.I have no idea. 我不知道。
2.I have no clue.
3.It beats me. 你把我问到了。我被难倒了。我不知道。
A: Have you seen my notebook? I put it on the table hours ago.
B: Beats me.
A: 你又看到我的笔记本吗?我几个小时前把它放桌上了。
B:不知道。
4.Not as far as I know. 据我所知不。
5.“How should I know?” 我怎么知道?
A:Where did I leave my phone?
B:How should I know?
A:我把我手机放哪啦?
B:我怎么知道?
6.Don't ask me. 不要问我。
7.Search me. 我可不知道。
8.Dunno = don't know.
I dunno. 我不知道。