1.The boy is so young that he can't go to school.
The boy is not old enough to go to school.
The boy is too young to go to school.
2.The room is so small that not all of us can live in it.
The room is not large enough for us all to live in.
The room is too small for us all to live in.
3.They were so tired that they could not walk any further.
They were not energetic enough to walk any further.
They were too tired to walk any further.
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