Tom's teacher told Tom's mother his bad conduct in class.

汤拇的老师把汤拇在帮上的恶劣行为告诉了他的妈妈。

conduct这里表示操行，品格，行为。注意它的读音，做名词和作动词时重音的位置不同；conduct还可做动词，表示指挥，主持。

conduct a meeting。主持一个会议。
Our workers are not only evaluated by their performance but also their conduct.
我们评价员工不但是看他们的工作表现还看他们的操守。