I think she knows him well enough to tell him from the other Scotsmen. If you mean "tell" in the sense of imparting information to someone, you must specify what she is supposed to be telling him.
How does lady macbeth cover for macbeth at the banquet?
Lady Macbeth is the wife of the title character, Macbeth, a Scottish nobleman.
She rang a bell to notify Macbeth the coast was clear.
The reaction between Lady Macbeth and Macbeth is initially very different after they kill Duncan. Lady Macbeth is enthusiastic but Macbeth regrets his actions.
Lady Macbeth
Lady Macbeth is often portrayed as a fourth witch.
Lady Macbeth
Tension -Apex
Grouch It should be Gruoch.... She was Lady Gruoch of Scotland before she married Macbeth. Throughout the play she is usually referred to as Lady Macbeth.
Lady Macbeth tells Macbeth to hide his emotions and actions.
Macbeth wrote Lady Macbeth a letter describing his encounter with the witches. Lady Macbeth reads it out at the beginning of Act I Scene 5
The difference is that Lady Macbeth at first wanted Macbeth to kill Banquo and Macbeth was too scared to do it. Later on in the tragedy, Lady Macbeth gets haunted and gets mentally ill and Macbeth keeps on killing people.