It depends on the orator. If you listen carefully to famous speeches, you will hear contractions. html
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Mercyful_fateWhenI can't think of any realistic case where "I want to go to the park" would be part of a formal speech. I'm thinking of a presidential state of the union ahavinggiving a formal speech do Americans use contractions and linking? ... when they say something like "I want to go to the park" ...