Which evidence from the text best supports the idea that lady mcbeth believes macbeth will not be strong enough to do what is necessary in order to become king

She thinks that because he's weak and very ill I believe and so she's worried about him.

I hope this helps.

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dramatic irony occurs when the reader/audience knows more about a character's situation than the character does. the one main effect is that it gives the reader a sense of superiority, or detached superiority. the reader not only seemingly discovers what is revealed, but feels superior for doing so.