it v-link ADJ for n to-inf
The 'possible' group
These adjectives indicate that an event or situation is possible or impossible. The event or situation is indicated by the prepositional phrase beginning with for and the to-infinitive clause.
impossible inconceivable possible
'People said it would be impossible for me ever to get fit enough to ride again, but I refused to believe it,' he said.
We should ask whether it is possible for there to be too much of a good thing.