它属于五种基本句型里的主+谓+宾结构,例如 I beg to differ.我不敢苟同.
能用此结构的动词有:
决心decide determin学会learn想want希望expect wish hope,拒绝refuse设法
manage strive愿care假装pretend,主动ofer答应promise选choose 计划plan,同意agree请求ask beg帮一帮help.为方便记忆大家把汉字连成句.
另外再加上afford to do sth 承担的起
3. 在一些动词之后，可以在连接代词（what/who/which)或者连接副词（how/when/where)
以及whether后面接一个带to的动词不定式。这种结构是连接词宾语从句的简略形式。
I wonder who to invite. (= who I should invite) Show us what to do. (=what we must do)
I don’t know whether to answer his letter. (=此处不用if）
4..不定式作宾语时,如带有宾语补足语,则要把不定式放到后面,用it作形式宾语,
构成\主语+动词+it+宾补(形容词,名词)+不定式\
He found it very difficult to get to sleep. 他发现很难入睡.
注意：常用此结构的动词有consider,judge,make,feel,make 等。
句型四： 形容词+ to do sth
of sb to do 用来说明人的性格特征和行为表现的动态形容词与不定式连用，
常用brave,careful cruel, generous,clever, foolish, kind, modest, pilite,nice,rude,stupid,等形容词 It is wise of you not to agree with you. It is generous of him to lend me his car, 不定式作状语 ⒈作目的状语
(1) ①I stayed there to see what would happen.
②Henry has decided to go to the hospital to be examinedby the doctor. (2)有时为了强调，不定式前可加in order或so as。如：
Bob took down my telephone number so as(in order)not toforget it. 有时为强调目的状语可把in order to或不定式置于句首，但so as to不能这样用。
在这种句式中不定式部 分可转换为so that,in order that,成为目的状语从句，如：
I stayed there so that (in order that)I could see whatwould happen. (3)在部分表示感情色彩的形容词、过去分词或动词之后可接不定式，如：astonished,glad,happy,laugh ,pleased, sad,smile,sorry,surprised等。
①We are glad to hear the news.
②I was surprised to see that a three-year-old baby could write so well.
在部分形容词后接不定式，用主动形式表示被动意义，这种句型中的主语是不定式的逻辑宾语。
如：The question raised by thestudent is difficult to answer.
The room is really comfortable to live in. 常
这
样
用
的
形
容
词
有
：
comfortable,easy,dangerous,difficult,expensive,fit,impossible等。 ⒉作结果状语
We came home after our holiday to find our garden neat and tidy. 不定式作结果状语还常用在下列句式中。如： ①so…as to;such…as to
I'm not so stupid(a fool) as to put it in writing.我不至于愚蠢到会把它写下来。
I'm not such a stupid fool as to put it in writing. ②enough…to
The speed is high enough for us to catch up with thefirst liner. ③only to
Jane hurried back only to find her mother dying inthehospital. ④too…to
I'm too tired to stay up longer.
专升本考试英语语法总结
