7）不定式作主补带有宾语及宾语补足语结构的动词变为被动语态时，
原来的宾语变为主语，宾补则变为主补。加主补的动词主要有：assume，believe， know， report， say， suppose等。
「例如」Mr. Brown is said to have left for Italy last week.（It is said that Mr. Brown left for Italy last week.）Persons have been said to climb on roofs， solvemathematical problems， compose music， walk throughwindows and commit murder in their sleep He is reported to have won the 100meter running racein the Olympic games.
8）不定式作定语
a）不定式作定语通常要放在其所修饰的名词或代词之后。
不定式常作下列的名词定语：attempt， ability， anything，chance， desire， determination， decision， effort， failure，ntention， need， opportunity， plan， promise， pressure，right， tendency，time， way等。
「例如」His efforts to carry out the plan were successful.I haveno intention to go to the cinema with you.There is no need to bother him with such triflesThere is a tendency to writer quite long sentencesin commercial correspondence.The pressure（ ）causes Americans to be energetic，but it also put them under a constant emotional strain.（CET-4 1997，6） A） to compete B） competingC） to be competed D）shavingscompeted
pressure后面应接后置定语，表示竞争的压力。单个分词作定语一般置于名词前，故B和D可以排除。C为不定式的被动式，而竞争和压力之间没有被动关系，因此正确答案为A.特别注意的是在不定式与其修饰的名词有动宾关系时，要根据句子的需要在不定式后加适当的介词，这个介词的选用取决于被修饰的名词或不定式本身的要求。
「例如」She is a very nice person to work with.This is an important issue to talk about.
b）由only， last， next，序数词或形容词最高级修饰的名词常用不定式作定语。
「例如」
Mr. Zhang is always the first man to arrive at the officeand the last man to leave.I don‘t think he is the bestone to do the work.
9）不带to的不定式在下列词组后面的不定式不带to：would rather ……than（宁愿……也不）， had better……（最好），can‘t helpbut……（不得不）， had rather……（宁愿），cannot but……（不得不，必然），may/might as well……（不妨）， let alone（更不用说）。
「例如」 You‘d better return the books to the libraryon time. Otherwise， you will be fined. I can’t help but wish that nothing would go wrong.They had never seen such delicious food， let alone eat it.
，动词不定式用法大荟萃