be careful to do sth和be careful(not) to do sth的用法

前者是表“小心翼翼(或仔细的）去做某事”,如：He was careful to answer the questions which were asked by the reporter.他小心翼翼地回答了记者提出的问题.后者是表“小心别.、避免去干...”,如：he was very ca...