It's impossible for the job to be finished in time.
It's a good idea for us to travel in separate cars.
There is a definition in the books :
adjective + for + object + infinitive
noun+ for + object + infinitive
As far as I know, to find the object in the sentence, some questions are asked to the sentence. ( Whom or What )
What do you mean by '' object '' in this sentences? What questions should be asked in this sentences to find the object ?