Meaning of 知っ in Japanese

Seeing that you're not surprised, I think you must have known.

Is it any of your business what someone's hobby is?

I think there are probably few Japanese who know this side of the Emperor Meiji, the side that left a song like this.

I'd rather not have those written by people who only know their work imperfectly.

I've heard of pseudomyopia, but I never thought my own child would come to have it.

What's different from Japan is that the doctors of Singapore generally all know each other.

Coincidentally enough, I know him.

Well then, does everybody know the anime called Mai Hime?

You know about 'ra-skipped words'? It looks like quite a lot of students are using mistaken words.

"By the way, do you know what a Shinto shrine is?" "I've a little bit of knowledge on the subject. It's a religious facility where that which is the object of worship, that called the genius loci, is enshrined."