四、不定式的句法功能

1. 作主語

To see is to believe. 眼見為實。

To talk with him is a great pleasure. 和他談話是一件非常愉快的事。

To remember this is very important. 記住這一點很重要。

注：為了避免頭重腳輕，在許多情況下，通常都將作主語的不定式置于句子后部，而在句首使用的主語位置使用形式主語it：

It’s very important to remember this. 記住這一點很重要。

It’s a pity to leave so early. 這么早走太遺憾。

2.作表語

He seems to be ill. 他似乎有病。

Her wish is to be a teacher. 她的愿望就是當一名教師。

You are not to smoke in this room. 你不應在這個房間里吸煙。

注：不定式作表語主要有三種情況，一是用于seem, appear, prove, turn out等連系動詞之后的不定式(尤其是to be)，二是像My job is to sweep the floor(我的工作就是擦地板)這樣的主語與表語“等價”的情形，三是表示想法、約定、義務、命令、可能性、命運等，再如：

We are to meet at the station at three. 我約定3點鐘在車站見面。(表約定)

How are we to convince him? 我們怎么能說服他呢? (表可能性)

You are to come when I call. 叫你來的時候，你必須來。(表命令)

3. 作賓語

I can’t afford to buy a car. 我買不起汽車。

Remember to post the letter. 記住把信寄了。

I hope to be staying with you. 我希望和你住在一起。

注：不定式不僅用作動詞的賓語，還可用作個別介詞(如but, except)的賓語：

I had no choice but to wait. 除了等，我沒有別的選擇。

It had no effect except to make him angry. 除惹他生氣外，沒產生任何效果。

4. 作賓語補足語

Who taught you to drive? 誰教你開車的?

He warned me not to touch it. 他警告我不要觸碰它。

What caused him to change his mind? 什么使他改變主意的?

注：當作賓語的不定式后跟有賓語補足語時，通常要用形式賓語it代替不定式，并將真正的賓語不定式置于賓語補足語之后：

It find it difficult to learn Japanese well. 我感到學會日語不容易。

5. 作定語

I have a question to ask you. 我有一個問題要問你。

It is a pleasant thing to remember. 這是一件值得記住的愉快的事。

He is not a man to tell a lie. 他不是個說謊的人(www.hz123456.com)。

注：有的名詞(如way, chance, right等)后用作定語的不定式可換成of doing sth：

It’s the best way to do [of doing] it. 這是做此事最好的辦法。

但是，以下名詞后接不定式作定語時通常不能換成of doing sth：

attempt 試圖  courage 勇氣    decision 決定    effort 努力    fortune 運氣

failure 失敗   invitation 邀請  permission 允許   promise 允諾  wish 愿望

6. 作狀語

不定式作狀語可以表示多種關系(如目的、結果、原因、條件等)：

I went to France to learn French. 我到法國去學法語。(表目的)

He returned home to find his wife waiting for him. 他回到家發現他的妻子在等他。(表結果)

You would make a great mistake to accept his offer. 你要是接受他的建議，你就犯了大錯誤。(表條件)

We are proud to be members of this team. 作為這個隊的隊員我們感到很自豪。(表原因)

He opened his mouth as if to say something. 他張開嘴，好像要說什么。(表方式)

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