How does gibson use dramatic irony to create suspense in this passage

cambridge english dictionary defines dramatic irony as "the situation in which the audience of a play knows something that the characters do not know"in henrik ibsen's play "a doll's house," the nurse does not know that nora will leave her children, but the audience does.   henrik ibsen uses this dramatic irony to create suspense in this passage regarding nora's exit.the following lines from the play give the answer : "nora to nurse:

nora: well, anna, i won’t be able to be with them as much any more.

nurse: oh well, little children get used to everything.

nora: do you think do you think they’d forget their mother if she went away for good? "

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