【too to】英语语法too.to结构

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【答案】 【too...to 结构表示肯定含义的情况】
　　我们知道too...to结构一般表示否定含义,意为太...以致于不能
　　eg:He is too old to work.
　　但too...to在下列情况下却表示肯定含义:
　　⑴当too前或to前有否定词构成双重否定时.
　　eg:English is not too difficult to learn.
　　英语并不太难学.
　　He is too wise not to see that.
　　他很聪明,不会不懂这一点.
　　⑵当too后是glad,pleased,happy,delighted,satisfied,ready,willing,kind,apt,good,
　　true,easy,near,careful,well,early,delicious,eager,anxious等形容词或副词时.
　　eg:They are too anxious to leave.
　　他们急于离开.
　　He is too ready to help others.
　　他总是乐于助人.
　　与这些词连用时,too前还常加上only,all,but,just,simply等副词,意思不变,因为这些词加上too后与very同义.
　　eg:I'm only too glad to see you .
　　见到你非常高兴.
　　They are but too pleased to hear the news.
　　他们听到这个消息,非常高兴.
　　⑶与cannot连用时.
　　eg:You cannot be too careful(=You can never be careful enough) to do your homework.
　　你做作业越仔细越好(=无论怎样仔细也不过分).
　　⑷当不定式在句中作定语或真正的主语时.
　　eg:There are too many problems to be solved.
　　有很多问题有待解决.
　　It is too much to say that he is a fool