В предложении инфинитив может выполнять следующие функции:
1) подлежащее (Subject) – To compromise appears advisable.
2) именная часть составного именного сказуемого (Predicative) – His greatest wish was to tell her everything.
3) часть составного глагольного сказуемого (Part of a Compound Verbal Predicate) – He seemed to know all about it. He must know her address. I’m happy to hear it.
4) дополнение (Object) – He didn’t want to be left alone.
5) определение (Attribute) – He gave her permission to leave.
6) обстоятельство (Adverbial Modifier):
a) цели (Adverbial Modifier of Purpose) – I did my best to stop her.
b) следствия (Adverbial Modifier of Consequence) – He was old enough to be her father.
c) образа действия (Adverbial Modifier of Manner) – She nervously moved her hand towards his lips as if to stop him.
d) сопутствующих обстоятельств (Adverbial Modifier of Attendant Circumstances) – She was driven away, never to visit this neighbourhood.
7) вводный член предложения (Parenthesis) – To tell the truth, I’m sick and tired of this nonsense.
8) инфинитивные конструкции (Infinitive Constructions):
a) оборот «for + Noun (Pronoun) + Infinitive» (the for-to-Infinitive
Construction) – The water was too cold for the children to bathe.
b) оборот «Объектный падеж с инфинитивом» (the Objective-with-
the-Infinitive Construction) – I want him to help me.
c) оборот «Именительный падеж с инфинитивом» (the Subjective
Infinitive Construction) – He is said to know Chinese very well.