请分析一下该句的成分.When is doubt about the meaning of a word,consult a dictionary.
问题描述：
请分析一下该句的成分.When is doubt about the meaning of a word,consult a dictionary.
麻烦解答时将句子成分包括每一个词的作用都说明一下，
答
When is doubt about the meaning of a word我觉得应该是When there is doubt about the meaning of a word吧,在这里是一个状语从句,做状语修饰consult a dictionary.我们这里可以这样理解,主句consult a dictionary说查字典,是祁使句,有完整的谓语,宾语.这是句子里可以再加上的,就是一个状语,说明这样做的条件原因方式等.