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“too…to”的用法语法结构为“too＋形容词／副词+to+动词原形”,通常被翻译为“太…而不能…”。在此结构中,不定式是否带宾语,通常取决于其是否为及物动词。
1. “too…to”的语法规则
（1）He is too shy to give a speech. 他因过于害羞而不敢发表演讲。
（2）It's too far to arrive there on time. 距离太远,无法准时到达。
2. 不定式的逻辑主语：有时,不定式前可由介词for引导出一个逻辑主语。
（1）It's too expensive for her to purchase. 价格太高,她买不起。
（2）The box is too heavy for the boy to carry. 箱子太重,男孩提不动。
3. 不定式带宾语的情况：一般来说,“too…to”结构中的不定式是否带宾语,取决于它是否为及物动词。
（1）He is too tired to continue walking. 他太累了,无法继续前行。
（2）The room is too dirty to reside in. 房间太脏,无法居住。
4. 不定式的被动语态
（1）The text is too difficult to comprehend. 这篇课文太难理解。
（2）The text is too difficult for the students to understand. 这篇课文对学生来说太难理解了。
5. 与“so [such]…that”结构的转换
（1）The child is too young to dress himself.
→The child is not old enough to dress himself.
（2）The box is too heavy for me to carry.
→The box is so heavy that I can’t carry it.
6. “too…to”有时表达肯定意义
（1）He is too clever not to grasp this. 他如此聪明,不可能不懂这个。
（2）Never too old to learn. 学习永无止境。