"too ... to": S + be + too + adj + (for SO) + to V
"enough .... to": S + be + adj + enough + (for SO) + to V
`21`. It was too cold for us to go out.
`=` It wasn't warm enough for us to go out.
`22`. Mr Pike is too weak to walk without a stick.
`=` Mr Pike isn't strong enough to walk without a stick.
`23`. The ground is too hard for us to dig.
`=` The ground isn't soft enough for us to dig.
`24`. The elephant is too big to run fast.
`=` The elephant isn't small enough to run fast.
`25`. Your handwriting is too bad for me to read.
`=` Your handwriting isn't good enough for me to read.
