英语不定式作宾补和不定式作状语的区分？

Question

The teacher ask the students to close thewindows.
he boy needs a pen todo his homework.
这两个句子的不定式，哪个是作宾补，哪个是作状语，怎么区分？
是the windows 和 to do 问题里两个单词没有空开。

Answer 1

The teacher ask the students【 to close the windows宾补，由于是宾语the students的动作】
he boy needs a pen 【to do his homework目的状语】如句子变成：
To do his homework, the boy needs a pen.
宾补就是宾语发出的动作。.

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