She is willing to share things with her friends 中的不定式to shar

这是不定式作状语,用来修饰形容词,构成下列词组：be able to, be afraid to, be easy to, be eager to, be likely to, be ready to, be sure to, be unable to, be unwilling to, be willing to等.例如：I am willing to help you with your homework.
Chinese team is bound to win the World Cup.