语法在线之构词法10问10答
   指出以下各句画线部分单词构词方式    1. When he has a walk after supper, he usually walks his dog.    他晚餐后散步时常遛狗。   
【答案】 (词性)转化　
    2. His carelessness cost him his first place in the math competition.    他数学竞赛时粗心大意没拿到第一名。
【答案】加后缀
    3. Her misunderstanding of what I said led to my depression.    她对我话误解使我很沮丧。
【答案】加前、后缀