Answer: Modals significantly impact English communication by adding nuance and precision to our expressions. They convey a wide range of meanings, from certainty to uncertainty, ability to obligation, and permission to advice. For instance, "must" signifies strong certainty, while "may" expresses uncertainty. Modals like "can" and "could" denote ability, and "may" and "can" are used for permission. "Must," "should," and "ought to" convey obligation and advice. By using modals appropriately, we can communicate effectively, sound more natural, and build stronger relationships.