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,

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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,

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,
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,

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,
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 to do.我们必须考虑怎么办.what to do 就在句中做宾语;
The question is how to find him.问题是如何找到他.how to find him 就在句中做表语;
而题目中的how to make requests 接在know后面,作宾语;没有how doing的用法.

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。