楼主说的动宾结构是“to +动词+名词”的结构吗?我不是很能理解动宾结构~
可以作主语的结构有：
1、名词或名词短语
2、代词
This is my teacher.this 是这个句子的主语.
Who are your brother?who 是主语.
3、数词
Four and five make nine.four 和five是主语
4、不定式或不定式短语
To become a doctor is my dream.to become a doctor 是主语
5、动名词或动名词短语
Remembering new words is so hard.remembering new words 是主语
6、从句
What we cann't get is usually best.what we cann't get 是主语