I don't understand how people who train for the 100 meter race can move so fast.
Here, the thing being modified by the last word of the sentence is the verb "move." There is no need for "fastly" because "fast" is both an adjective and an adverb.
There is no need for "fastly" because "fast" is both an adjective and an adverb.
940 MCQ for effective preparation of the test of Adjectives and Adverbs of English Grammar section.
Read the MCQ statement: I don't understand how people who train for the 100 meter race can move so fast., keenly and apply the method you have learn through the video lessons for Adjectives and Adverbs to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 141-4420.