fast是副词还是形容词.=￣ω￣=

fast是副词还是形容词.=￣ω￣= so fast 的 fast 是形容词还是副词 a.是形容词还是副词? hard是形容词还是副词? late是形容词还是副词 Late是形容词还是副词? really是形容词还是副词? enough是形容词还是副词 loud 是形容词还是副词? bad 是形容词还是副词 short是副词还是形容词 严重是形容词还是副词? healthy是形容词还是副词 exciting是形容词还是副词 maybe是副词还是形容词? cool 是副词还是形容词 fast的副词形式是fast还是fastly No matter how fast you run,you cannot catch up with a car.的fast是副词还是形容词?怎么判断?