不定式在句中可以作不同的句子成分,但是不能作謂語(yǔ).以下是簡(jiǎn)要解析及例句.
一、不定式用作主語(yǔ)
Tosee is to believe.
Totalk with him is a great pleasure.
Toremember this is very important.
【注】為了避免頭重腳輕,在許多情況下,通常都將作主語(yǔ)的不定式置于句子后部,而在句首使用的主語(yǔ)位置使用形式主語(yǔ)it：
It’svery important to remember this.
It’sa pity to leave so early.
二、不定式用作表語(yǔ)
Heseems to be ill.
Herwish is to be a teacher.
Youare not to smoke in this room.
三、不定式用作賓語(yǔ)
Ican’t afford to buy a car.
Rememberto post the letter.
Ihope to be staying with you.
四、不定式用作賓語(yǔ)補(bǔ)足語(yǔ)
Whotaught you to drive?
Hewarned me not to touch it.
Whatcaused him to change his mind?
五、不定式用作定語(yǔ)
Ihave a question to ask you.
Itis a pleasant thing to remember.
Heis not a man to tell a lie.
六、不定式用作狀語(yǔ)
不定式作狀語(yǔ)可以表示多種關(guān)系(如目的、結(jié)果、原因、條件等)：
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.