Unit 12 Art and literature
the film is great fun (=interesting) (for us) to see. 這部電影真有趣。
(3) 功能
①作主語
例：to see is to believe. 眼見為實。
不定式短語作主語時，往往由it代替它作形式主語，不定式移至謂語之后。
例：it is right to give up smoking. 戒煙是正確的。
②作表語
例：the next step is to make sure that you know exactly what is required. 下一步你要真正弄清楚需要的是什么。
my job is to help the patient. 我的工作是幫助病人。
they are to marry next week. （表示安排）他們下周結婚。
③作賓語
例：he wanted to go with us. 他想跟我們一起去。
feel, find, judge, make, think, believe, consider等動詞后如果是動詞不定式作賓語，補語是形容詞(間或是名詞)，常用it作形式賓語，把不定式后移。
例：i find it difficult to work with him. 我發現和他一起共事很難。
i thought it a great pity not to have invited her. 我認為沒有邀請她是很大的遺憾。
下列動詞常跟不定式作賓語：
agree, refuse, offer, promise, choose, decide, attempt, intend, manage, fail, ask, hope, want, expect, wish, desire, plan, prepare, learn, pretend等等。
④作賓語不足語
例：he asked me to do the work with him. 他讓我和他一起做這項工作。
在feel, hear, listen to, look at, notice, observe, see, watch, have, let, make等詞后的補足語中，不定式不帶to。但是這些句子如果變成被動結構時，就必須帶to.
例：i often hear him sing the song. 我經常聽到他唱歌。
he is often heard to sing the song.
⑤作定語
例：i have some books for you to read. 我有些書給你讀。
動詞不定式與其修飾的詞之間往往有動賓關系，如果該不定式是不及物動詞，其后應有必要的介詞。
例：he is a pleasant fellow to work with. 他是個很好共事的人。
she bought a bookshelf to put her books on. 她買了一個書架放書。