too to 句型后面跟doing 还是动词原形?

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too to 句型后面跟doing 还是动词原形?
too to 句型后面跟doing 还是动词原形?

too to 句型后面跟doing 还是动词原形?
动词原形
to 是不定式符号,不是介词
1.too...to句式中,如果too后接形容词ready(现成的)inclined(偏于..的)
apt(易于)等词时,无否定的意思
eg.He is too ready to talk.他爱说话
Men are too apt to forget.人们往往健忘
2.too..to 前面用否定词时,表示肯定
eg.It is never too late to learn.活到老学到老.

原形
I am too tired to do the work.