too...to... 与 enough...to... 与 so...that...的区别

1.too+adj./adv. to+v.太...而不能做某事 

例：He is too young to go to school. 

他年纪太小还不能上学。 

2.adj./adv.+enough to +v.足够...而能做某事 

例：He is old enough to go to school. 

他足够大了能上学了/他已到了上学的年龄了。 

3.so +adj./adv.+that从句 如此...以致 

例：He is so old that he can go to school. 

通常来说，这三种句型可用于同义句转换，具体如下： 

too...to... 

=not 反义词 enough to 

=so...that 否定句 

例：He is too young to go to school. 

= He is not old enough to go to school. 

= He is so young that he can't go to school.