It or that? (I know that - I know it)

[Van Khanh]

What it the difference btw “it” and “that”?, like in:

He is a known-well teacher. I know that.
He is a known-well teacher. I know it.

If the same, why there is 2 words???
Thanks

[Alan]

Hi,

In your two examples you would have to use well known as the adjective

[Van Khanh]

Dear Sir,

In this case:

He is a well known teacher. I know it's true.

and:

He is a well known teacher. I know that's true.

are the same meaning?

Thanks

[Alan]

Hi,

You can say both those, yes.

Alan
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