Infinitive used as modifier can have a passive meaning:
the bench is too wet to sit on
- "this bench can't be sat on"
The action "sit" is directed at the subject as if it were in passive voice although it is not in passive voice. The action can also be directed at the first object: I need a couch to sleep on - "sleeping" is directed at "couch". I am also interested in this usage.
I am trying to find if this meaning is always possible to create or there any limits to it. From what I understand, in each of my examples the infinitive is directed either at the subject or first object of the sentence. Are they correct and idiomatic?
He is too weak to talk to
She has 3 friends to talk to
She is difficult to lie to
I need a private jet to go on business trips on
He is the best man to borrow money from
He is too poor to spend money on ("we shouldn't spend money on him")
The company is too unstable to invest in ("we shouldn't invest in this company")
One more crucially important question:
He is too young to kill
Can be interpreted both ways:
We can't kill HIM because he is too young
HE can't kill (people), because he is too young
Is that correct that this sentence can be used/interpreted in both ways?