In this movie clip, starting at 41 seconds, Maui says:
When you use a bird to write with, it's called tweeting.
Does the to-infinitive clause modify "a bird"?
In this movie clip, starting at 41 seconds, Maui says:
When you use a bird to write with, it's called tweeting.
Does the to-infinitive clause modify "a bird"?
Yes, it tells you more about the bird the speakers is talking about. It's not just any old bird, it's a special kind of bird. Specifically, one that's used for writing or one that you use to write things with.
This type of structure is similar in principle to the fallowing examples:
She is a force to be reckoned with. (you would not want to make that woman upset or else you're going to have problems)
He's not a guy to be messed around with. (you would not want to mess around with that guy)
There is nothing to be ashamed of. (you should not be ashamed of it)
There is nothing to be worried about. (you should not be worried about it)