It is important for us to know how _______ requests politely.为什么填to makeIt is important for us to know how _______ requests politely.为什么填to make而不填making，to make 在句子中是什么成分呢，
问题描述：
It is important for us to know how _______ requests politely.为什么填to make
It is important for us to know how _______ requests politely.为什么填to make而不填making，to make 在句子中是什么成分呢，
答
to do使役动词. doing & done 现在&过去分词。how to do, what to do, 没有doing。当然，to do 在这里做目的状语。
答
在英语中,‘特殊疑问词(why除外)+to do’结构能够起到名词的作用,在句中可作主语、宾语、表语等,比如：When to leave has not been decided.何时离开还没有决定.when to leave 就在句中做主语；We must think what t...