1, - The man is too poor to buy a new bike for himself.
- The man is not rich enough to buy a new bike for himself.
- The man is so poor that he can't buy a new bike for himself.
2, - This room is too small for us to live in.
- This room is not big enough for us to live in.
- This room is so small that we can live in.
3, - This table is too heavy to lift.
- This table is not light enough to lift.
- This table is so heavy that nobody can lift.
4, It is too dangerous to drive too fast.

1,
=> The man is not rich enough to buy a new bike for himself.
=> The man is so poor that he can't buy a new bike for himself.
2,
=> This room is not big enough for us to live in.
=> This room is so small that we can live in.
3,
=> This table is not light enough to lift.
=> This table is so heavy that nobody can lift.
4,
It is too dangerous to drive too fast.