I have no idea where my keys are.
我完全不知道我的钥匙在哪里。
She has no idea how to fix the computer.
她完全不知道怎么修电脑。
They have no idea what they’re talking about.
他们根本不知道自己在说什么。
We had no idea the party was canceled.
我们完全不知道派对被取消了。
He has no idea how much I appreciate his help.
他根本不知道我有多感激他的帮助。
Do you have any idea what time it is?
你知道现在几点吗？（注意：这是“have any idea”的疑问形式）