前面是be动词用as carefulas,如果是是实义动词用as. carefully. as
动词后跟as carefully as;be 后是as carsful as
都可以，as as之间可以是副词也可以是形容词
按道理来说，是都可以的。要具体情况具体分析
as careful as as…as中间用原形
