She knows how to use a gun. I taught her, and I (was) afraid.

He knows me. I'm his teacher. I taught him everything he knows.

There goes a woman who knows all the things that can be taught and none of the things that cannot be taught

He knows all the lyrics.

We can't tell whether the abrasion was caused by a brickbat, a gun, a knife or what,

I taught her everything she knows, ... She played with me last year, and look what's happened. I hope I have the same impact on Tim as I did Paula.