The maths problem is too difficult for me to work out. 这道数学题太难我解不出来。
三、too... to... 结构表达肯定的意义
1. too 前面含有表示否定意义的词，如: not, never, nothing等时， too... to... 结构不表示否定的意义。例如：
It is never too old to learn. 活到老，学到老。(要学永远都不迟。)
2. 如果在too... to...这种结构的前面出现了only, 不仅免去了too的否定意义，
反而加强了too的肯定语气，only too 相当于very 或very much。例如：
I shall be only too pleased to get home. 到了家我将极其高兴。
3. too后接表示感情的形容词，如glad, pleased, happy, sad等时， too... to...句型不再表示否定意义，而表示的是肯定意义。例如： He is too sad to hear the bad news. 听到这个不幸的消息他太悲伤了。
四、too... to... 结构与enough...to... 结构及so... that...结构的相互转换
1. 将too...to...结构转换为enough... to... 结构时，要注意： (1) enough 前的形容词或副词应是too前面形容词或副词的反义词； (2) enough... to... 句式须用否定式；
(3) too... to...结构有逻辑主语时， enough... to... 结构也要加上逻辑主语。例如：
She is too young to do the work. = She isn't old enough to do the work.
The problem is too hard for him to work out.= The problem isn't easy
enough for him to work out.
2. 将too...to...结构转换为so... that... 结构时，要注意： (1) so... that... 结构是复合句，so 的后面接形容词或副词的原级，that的后面接从句。
(2) that后面的从句要用否定形式。例如：
She is too young to go to school. = She is so young that she can't go to school.
请同学们做做下列中考题，以便检验你对too... to...用法的掌握情况。
变换下列句型：
1. a. The box is so heavy that I can't carry it.
b. The box is ________ heavy______ ________ ________ carry.
c. The box is not ________ ________ for me to carry. 2. a. The maths problem isn't easy enough for me to work out. b. The maths problem is ________ difficult ________ I can't work it out. c. The maths problem is ________ difficult ________ ________ ________ work out.
3. a. The book is interesting enough for everybody to read. b. The book is ________ interesting________ everybody likes to read it.
Keys: 1. b. too, for me to c. light enough 2. b. so, that c. too, for me to 3. b. so, that
不定式作定语
不定式在句中作定语，置于被修饰的名词或代词之后。如： ①The next train to arrive is from Washington. ②Have you anything to be taken to your sister ③Do you have anything to say on the question ④Would you please give me some paper to write on ⑤My wish to visit France has come true at last. 不定式短语作定语和被修饰词之间表示以下关系： (1)表示将来的动作（例①）。
(2)与被修饰词之间有动宾关系，如是不及物动词，则需加介词（例④）。 (3)与被修饰词之间有动宾关系，同时与句中其它词之间又有逻辑上的主谓关系时，
尽管有被动含义，却仍 用主动语态（例③）；如只有动宾关系，而无逻辑上的主谓关系，
则需用被动语态（例②）。
(4)不定式作定语时，一般可转换为定语从句，例①to arrive=that will arrive。 作宾语补足语
一些及物动词除要求按宾语外，有时还需要有宾语补足语，说明宾语的行为、状态、特征， 这时意思才相对完整。
(1)常要求不定式作宾补的动词有：allow,ask,advise,beg,cause,drive（强迫），
encourage,expect,fo rbid,force,get,would like(love,hate),order,permit,persuade, teach,tell,want,warn,wish等。如：
①Would you like me to give your regards to Mary ②I want you to understand the whole passage clearly.
(2)部分动词后常接to be＋形容词、名词短语等形式，有时to be可省略， 如：
believe,consider,discover,find(=consider),feel(=think),imagine,judge,know,prove,
think,suppose,see(=understand),understa nd等。 ①We all believe John(to be)honest.
②I consider him(to be)one of the best biology teachers of No. 1 Middle School.
专升本考试英语语法总结
