题目内容
18．He didn'tunderstand（理解） what the word meant so he asked his teacher for help．分析 他没有理解这个单词的含义，所以找老师帮忙．
解答 答案：understand．表示理解用动词understand，这里是否定句，借助于did，后加动词原形understand．故答案是understand．
点评 做这类题型，首先根据所给汉语明确句子所要考查的单词或短语的拼写，再结合相关语法知识对单词或短语做出形式上的变化．
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