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▲be careful doing sth 的意思是“做某事很小心”，其中的现在分词短语 doing sth 可理解为时间状语（即做某事时，可视为在其前省略了in, when, while 等词）。如：Be careful dealing with such people. 和这种人打交道要小心。He emphasized the importance of careful driving. 他强调了小心驾驶的重要性。I pray that you’ll be careful driving in this storm. 我求你在这暴风雨中开车一定要小心。If you’d been more careful crossing the road you wouldn’t have been hit by the car.要是你过马路时小心点就不会被车子撞了。▲注意 be careful to do sth与be careful in doing sth 不同，前者指注意要做某事，后者指在做某事时很小心(其中的 in 与 while 同义)。如：He’s careful to read every sentence. 他注意读(即不漏读)每一个句子。He is careful in reading every sentence. 他读每个句子都很仔细。
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