英和和英

I know it for a certainty.

get to know

a know-all

tacit knowing

pretending to know

I know him

I am acquainted with him.

I know very well.

I know

to know one's way about―know the ins and outs of a matter―know the ropes

be aware of

knew full well

in an abrupt manner

That goes without saying.

It's a matter of course.

having knowledge of

the condition of being aware

to know by intuition

informed guess

Your understanding

to know beforehand

From you know who.

knowledgeable

a superficial knowledge of something

Knowing

to guess

a bit of knowledge

being well known

to have information in the mind

aware of