人教版初中中考复习英语语法精讲不定式的基本形式与用法.docx

人教版初中冲刺中考英语语法精讲:不定式的基本形式与用法
不定式得基本形式与构造
动词不定式指平日由to加上动词实情(如to write)所组成得一种非限制性动词形式，但在有些情形下to可以省略。
动词不定式有举行体和完成体(如上to be writing，to have written)，也有主动态(如to be written)，所有得主动词，不论是及物动词仍是不及物动词，也不论是举措动词仍是状况动词，都有不定式形式。助动词除be和have外，没有不定式形式。动词不定式在语法功用上可作主语、宾语、表语、定语和状语。
不定式得用法
1.Te get contact with his family in Taiwan made him extremely happy since they separated more than 40 years ago．
2.To finish that task in such a short time is really a challenge．
在上述情形下，若是不定式较长，显得头重足轻，则可由代词让作形式主语(形式主语it不可由that或this等其他代词庖代)，而将不定式放到后面。如：
1.It made him extremely happy to get contact with his family in Taiwan since they separated more than 40 years ago．
2. John admitted that it is always difficult for him to be on time．
不定式构造所示意得举措是谁做得，即不定式得逻辑主语，平日可以通过for sb.to do sth.构造表达：
It is quite important for us to read good books during a general review．
It is not difficult fot those talented students to pass the exam.
在某些形容词(如careless，clever，considerate，foolish，good，impolite，kind，naughty，nice，silly，stupid等)作表语时，不定式后可以加of来 指导 向导出其逻辑主语：
1.It is very kind of you to tell me the truth．
2.It is stupid of him to do such a silly thing．
2)不定式作宾语
不定式作宾语有两种：一种是及物动词后干脆跟带to得不定式，别得一种是“及物动词+疑问词+带to得不定式。
只能跟动词不定式得动词，常见得有:afford，agree，aim，appear，ask，believe，care，claim，decide demand，desire，determine，expect，fail，happen，hesitate，hope，intend，learn，long，manage，offer，pretend，promise，prepar