Translation of "أعرفُ" in English

لا أعرفُ هذه اللعبَةَ.

I don't know this game.

أعرفُ كَم تعني لكَ.

I know how much she means to you.

أعرفُ كَم يعني لكِ.

I know how much he means to you.

أعرفُ بأن الرجل يفضل الموت

I know a man who would rather die

ولا أعرفُ إن كنتم سمعتم بها.

I don't know if you've heard it.