小結(jié)：

1） 不定式可做除謂語以外的任何其他成分----主語、賓語、賓語補足語、表語、狀語、定語：不定式本身也有時態(tài)和語態(tài)的問題。每個不定式都有其邏輯主語，如果邏輯主語是動作的發(fā)出者，不定式用主動式，如果其邏輯主語是動作的承受者，不定式用被動式。

如：The doctor recommended him to clean the room. 醫(yī)生建議他打掃房間。

如：The doctor recommended the room to be cleaned. 醫(yī)生建議打掃房間。

2） 不定式的符號to 在一些特殊情況下經(jīng)常被省略。

A) 當幾個動詞不定式具有同樣的功能時，to 只用在第*個動詞不定式之前。

B) 在以why 引導的疑問句中不用to

e.g. He asked why (to) stay here.

C) 在had better, would rather, rather than, would sooner（寧愿）, can not but（不得不）, cannot help but, do nothing but（只能）等結(jié)構(gòu)后不用to

D) 在hear, listen to, feel, see, look at, watch, notice, let, make, have, leave, help等動詞后，動詞不定式做賓語補足語時不用to

不定式結(jié)構(gòu)的考察在職稱英語考題中主要是以完成句子題（可能涉及到不定式結(jié)構(gòu)）和文章中句子句意理解這樣的題出現(xiàn)。

如：2003年綜合B/A級完成句子考題：Keeping Cut Flowers

30. Another important way to prolong the life of cut flowers is ____.

A. by keeping its original shape and color

B. in the life of the cut flower

C. to produce carbon dioxide

D. for as long as possible

E. by controlling temperature

F. to replace the water and solution every day

文章相關句子：Another vital factor in keeping cut flowers is the quality of the water…

……………. The water and solution should also be replaced each day.

如：2002年理工類閱讀理解第1篇文章Mobile Phones中的第*個問題：

According to Robert Bell, if mobile phones prove to be dangerous to people's health,（系動詞+ 表語）

A. they should be banned immediately.

B. the use of them should be restricted.

C. all transmitter to towers should be torn down.

D. a warning label should be attached.

解答：問題問“如果手機被證明對人的健康有害，那么。?！?，文章中第1段的最后一句：If mobile phones are found to be dangerous, they should carry a warning label until proper shields can be devised. 該句的不定式結(jié)構(gòu)表述的語義與問題句中條件句（帶不定式結(jié)構(gòu)的謂語）的含義一致，所以判斷該句是答案相關句，并根據(jù)句意選擇答案D。

2005年衛(wèi)生類C級閱讀理解文章中也有考題直接涉及到不定式結(jié)構(gòu):

If you draw your money before it is due, you will have to ___.

A. pay interest to the bank

B. close your account

C. open a new account

D. pay a penalty or fee

D． 分析: have to 是“不得不/必須”， to是不定式符號。問題句是說“如果在你在你的前的前到期之前取錢，你將不得不…”。借助我們的相關背景知識可以對這道題進行直接判斷：D（支付違約罰金或手續(xù)費）合適。