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a)
-wonder: present
-appreciate: present
b)
– created: past
– dedicated: past
c)
– will live: future
– will: future
– know: present

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By using past, present, and future in this sentence, Lincoln uses the sentence’s syntax to mirror the meaning of the sentence.

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If Lincoln used the same tense for the entire speech, it wouldn’t be as powerful because it would be stuck in a time. Stuck in the past, present or future. By using each tense, he makes his message span and expand across time.