If you don't know, Captain, it must be bad news.

"I don't know, Captain; unfortunately, the only way to find out is to try it."

I don't know what you were told to expect, Captain.

"There is one more thing you should know, Captain."

"I hope you know what you're doing, Captain," she said.

I just want you to know it won't happen again, Captain.

"There is something you should know, Captain," the doctor said, hesitating for just a moment.

"I want to know, did you bring the media, Captain?"

We know what you were doing here today, Captain.

But you don't necessarily have to know how something works to use it, Captain.