carefulluy 这个单词打错了吧，只有carefully，carefully是副词只能修饰动词，be carefully的说法不对，As long as you drive carefully, you will be very safe.
如果你开车小心，你就会很安全。这里carefully是修饰drive的。而be careful =carefully，careful是形容词，be是系动词，也可以单独使用，是小心的意思例如 Be careful crossing the road.
过马路要当心。
careful是形容词 carefully是副词
please be careful 中的careful是形容词表语 修饰be
he is carefully driving a car 中的carefully是副词状语 修饰driving
eg:please be careful. 小心
eg:he drives carefully. 他小心地驾车
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