How is shakespeare tension through scene two?

This is an extremely dramatic scene and Shakespeare sets the stage for the bloody murder with the "owl that shriek'd, the fatal bellman," as even nature cries out against the murder of Duncan. Lady Macbeth fears that the murder is unaccomplished, yet when Macbeth enters, he says, "I have done the deed." Suspense is heightened here by the quick exchange of dialogue between husband and wife:

"Did you not speak?" 

"When?"

"Now."

"As I descended?"

what does the teacher mean

#1  sara was always tasked with selecting birthday presents for her friends and family because everyone admired her  impeccable taste. 

impeccable (adj): perfect, flawless

#2  they moved to the united states many years ago, but their  insular  attitudes made it difficult for them to socialize. 

insular (adj): isolated; separate

#3  the professor explained the  semantic  relationship between the two nouns used in the sentence. 

semantic (adj): related to words or the meanings of words 

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