动词不定式相当于名词、形容词或副词,动词不定式在句中可以作句子除谓语之外的任何
句子成分,但它有动词的属性。
It's a great honour to be invited to Mary's birthday party.(不定式作主语是被动语态to be invited是被邀请)
It was impossible for lost time to be made up.(不定式作主语)
I wish to be sent to work in the country.(不定式作宾语)
Can you tell me which is the car to be repaired?(不定式作定语)
My work is to clean the room every day.(不定式作
表语)