1. part. A particle used for marking the following verb as an infinitive.
I want to leave.
He asked me what to do.
I don’t know how to say it.
I have places to go and people to see.
Example Sentences
The two are in consultation as to which of them should run.
It is always nice to have a reminder as to why I left you.
They're clues as to how to live your life.
As to warnings, most of the people have not developed the ears to hear.
Few were in doubt as to what this meant.