小男孩太小不能去上学 用so that,so...that...,too...to...,enough...to...的用法怎么说

1. The little boy is so young that he can not go to school.
2. The little boy is too young to go to school.
3. The little boy is not old enough to go to school.

The boy is too lillte to go to school.
The boy is not old enough to go to school.
The boy is too lillte so that he doesn't go to chool.
The boy is so litlle that he doesn't go to chool.