Why do we say that someone does aerobic exercise rather than saying that he or she exercises aerobically? Both follow the rules of grammar, but only the first is the proper idiom.
Look at the following two sentences and decide which is idiomatic:
The first sentence is the correct idiom. Why is it correct to say "at length" but incorrect to say "speaks lengthily"? There is no specific reason. "At length" is simply a common phrase that developed over time, and has come to be accepted as linguistically correct.
Use your ear to test out idioms, and memorize any unfamiliar idioms that you encounter before test day.
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