Question

The old woman was        sad        say a word.

A. enough; to    B. too; to    C. so; to    D. very; to

Answer

B

【解析】句意：这位老太太太伤心了，一句话也说不出来。too…to…的意思是“太……不能……”，结合句意可知，答案为B。

点睛：so…that, too…to和enough to都是初中英语教材中的重要结构，在一定条件下它们可以相互转换，并经常成为中考考查的热点之一。

so…that与too…to的转换

当that引导的从句为否定式且从句主语与主句的主语相同时，so…that可转换为too…to结构；若从句主语与主句的主语不相同时，so…that可转换为too…for sb to结构。例如：

She is so young that she can’t go to school. ＝She is too young to go to school.

The box is so heavy that he can’t carry it. ＝The box is too heavy for him to carry

so…that与enough to的转换

当that引导的从句为肯定式时，若从句主语与主句主语相同时，so…that可转换为enough to结构；若从句主语与主句主语不相同时，so…that可转换为enough for sb to结构。例如：

Xiao Lin is so old that he can go to school. ＝Xiao Lin is old enough to go to school.

The box is so light that he can carry it. ＝The box is light enough for him to carry.

enough to的句式为否定式时，enough to可以转换为too…to结构。 转换后的too…to结构中的形容词（副词）要用其相应的反义词。例如：

He is not old enough to do the work. ＝He is too young to do the work.

The problem is too difficult for me to work out. ＝ The problem isn’t easy enough for me to work out.