关于 不定式 的句子个成分

不定式在句中可以作不同的句子成分,但是不能作谓语.以下是简要解析及例句.
一、不定式用作主语
Tosee is to believe.
Totalk with him is a great pleasure.
Toremember this is very important.
【注】为了避免头重脚轻,在许多情况下,通常都将作主语的不定式置于句子后部,而在句首使用的主语位置使用形式主语it：
It’svery important to remember this.
It’sa pity to leave so early.
二、不定式用作表语
Heseems to be ill.
Herwish is to be a teacher.
Youare not to smoke in this room.
三、不定式用作宾语
Ican’t afford to buy a car.
Rememberto post the letter.
Ihope to be staying with you.
四、不定式用作宾语补足语
Whotaught you to drive?
Hewarned me not to touch it.
Whatcaused him to change his mind?
五、不定式用作定语
Ihave a question to ask you.
Itis a pleasant thing to remember.
Heis not a man to tell a lie.
六、不定式用作状语
不定式作状语可以表示多种关系(如目的、结果、原因、条件等)：
Iwent to Franceto learn French.
Hereturned home to find his wife waiting for him.
Youwould make a great mistake to accept his offer.
Weare proud to be members of this team.