在这个句子里谓语动词是 is raining 修饰动词要用副词 所以用heavily 而不用 heavy。heavy是形容词 一般做定语,如 It is a heavy rain. 或作表语,如:The rain is heavy.heavily是副词,一般做状语,如:It rains heavily.
副词(adv.)修饰动词 It rains heavily.(副词heavily修饰动词rains)副词(adv.)修饰形容词 The rain was really heavy.(副词really修饰形容词heavy)副词修饰副词 It can run quite fast.(副词quite修饰副词fast)副词修饰句子 Luckily,he came back at last.形容词(adj.)修饰名词或者代词:举例:you...