too……to用法

too…to….用法•too...to句型形式上是肯定的，但是它在意义上却是否定的，表示太……而不能……。too的后面接形容词或副词的原级，to的后面接动词原形。too...to...句型是简单句。•例如：•Heistooyoungtojointhearmy.•他年龄太小，不能参军。•二、动词不定式的逻辑主语•动词不定式所表示的动作的执行者与整个句子的主语不指同一人或物时，需要在动词不定式前加上一个逻辑主语(常用forsb.)。例如：•Themathsproblemistoodifficultformetoworkout.•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：•Itisnevertoooldtolearn.•活到老，学到老。•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，onlytoo相当于very或verymuch。例如：•Ishallbeonlytoopleasedtogethome.•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：•Heistoosadtohearthebadnews.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：•Sheistooyoungtodothework.•=Sheisn'toldenoughtodothework.•Theproblemistoohardforhimtoworkout.•=Theproblemisn'teasyenoughforhimtoworkout.•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：•Sheistooyoungtogotoschool.•=Sheissoyoungthatshecan'tgotoschool.•变换下列句型：•a.TheboxissoheavythatIcan'tcarryit.•b.Theboxis________heavy______________________carry.•c.Theboxisnot________________formetocarry.tooenoughlightmeforto•2.a.Themathsproblemisn'teasyenoughformetoworkout.•b.Themathsproblemis________difficult________Ican'tworkitout.•c.Themathsproblemis________difficult________________________workout.toformetoothatso•3.a.Thebookisinterestingenoughforeverybodytoread.•b.Thebookis________interesting________everybodylikestoreadit.sothat•1．Thewaterwassodirtythatwecouldn'tdrinkit．•Thewaterwas____dirtyforus____drink．tooto•2．Thechildissoyoungthathecan'tputonhisclothes．•Thechildisn't____________putonhisclothes．oldenoughto•3．Theproblemistoodifficultformetoworkout．•Theproblemisn't________formetoworkout．easyenough