no more…than与not more…than
有这样一道考题，请看是该选no more…than还是not more…than？
You are _____ careful than your brother. You two can’t do the work that needs care and skill.
A. not more B. no more
C. not less D. no less
【分析】容易误选A。要做对此题，首先要正确理解以下结构的含义：
not more … than = 不如……
no more … than = 和……一样不 (否定两者)
not less … than = 不如……不 (即指不如 less 后形容词的反面)
no less … than = 和……一样 (肯定两者)
比较以下各句的意思：
You are more careful than he is. 你比他仔细。
You are not more careful than he is. 你不如他仔细。
You are no more careful than he is. 你和他一样不仔细。
You are less careful than he is. 你不如他仔细（你比他粗心）。
You are not less careful than he is. 你比他仔细（你不如他粗心）。
You are no less careful than he is. 你和他一样仔细。
通过以上分析，再结合句子语境，可知此题最佳答案为B。