As you know VS. You know

Hans51As you know, this needs a lot of preparation.

This is literal. It says that I recognize that you are already aware of what I am saying.

Hans51You know, this needs a lot of preparation.

This is not literal. Here "you know" is something between an attention getting device and a pause word. You can usually substitute "

"Guess who I've just seen? Maggie! You know—Jim's wife."

I have seen this sentence in a dictionary and then I was wondering if there is a overlapping meaning with 'as you know' in this case?

Are they the same in meaning?

Like "Guess who I've just seen? Maggie! AsGuess who I've just seen? Maggie! As you know—Jim's wife."

What do you think? Thank yo

Hans51I have seen this sentence in a dictionary and then I was wondering if there is a overlapping meaning with 'as you know' in this case?

Of course there can always be overlap in the use of as you know and you know. There's only one extra word in one of them. In the sort of thing you have here in your example, however, it would be odd to hear

CalifJimYou know means you know (who I'm talking about). (You know that Maggie is Jim's wife.)

All of a sudden, I fell into confusion with usage of brackets, so I was wondering if the meaing of the brackets is optional here? and then how can I understand (You know that Maggie is Jim's wife.)?

Is this

You know means you know (You know that M