一、so…that與too…to的轉(zhuǎn)換
當that引導(dǎo)的從句為否定式且從句主語與主句的主語相同時,so…that可轉(zhuǎn)換為too…to結(jié)構(gòu)；若從句主語與主句的主語不相同時,so…that可轉(zhuǎn)換為too…for sb to結(jié)構(gòu).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.

二、so…that與enough to的轉(zhuǎn)換
1. 當that引導(dǎo)的從句為肯定式時,若從句主語與主句主語相同時,so…that可轉(zhuǎn)換為enough to結(jié)構(gòu)；若從句主語與主句主語不相同時,so…that可轉(zhuǎn)換為enough for sb to結(jié)構(gòu).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.
2. 當that引導(dǎo)的從句為否定式時,若從句主語與主句主語相同時,so…that可轉(zhuǎn)換為enough to的否定結(jié)構(gòu)；若從句主語與主句主語不相同時,so…that可轉(zhuǎn)換為enough for sb to的否定結(jié)構(gòu).同時要注意,轉(zhuǎn)換后的形容詞（副詞）要用其相應(yīng)的反義詞.例如：
The man is so old that he can’t go to work. ＝The man isn’t young enough to go to work.
The desk is so heavy that I can’t move it. ＝The desk isn’t light enough for me to move.

三、enough to的句式為否定式時,enough to可以轉(zhuǎn)換為too…to結(jié)構(gòu).但轉(zhuǎn)換后的too…to結(jié)構(gòu)中的形容詞（副詞）要用其相應(yīng)的反義詞.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.