小升初必備語法：用作介詞的to
to 有兩種用法： 一爲不定式+動詞原形; 一爲介詞+名詞/動名詞, to 在下面的用法中是第二種，即to+ 名詞/動名詞：
admit to承認， confess to承認，
be accustomed to 習慣於， be used to 習慣於， stick to 堅持， turn to開始，着手於， devote oneself to 獻身於， be devoted to 致力於， look forward to 盼望， pay attention to 注意
英語語法經典例題800例：非謂語動詞（例題1）
【導語】英語語法讓很多學生都頭疼，因爲複雜難懂的句式和詞組有時難以記憶。爲大家整理了英語語法大全，希望對同學們的英語語法學習有所幫助。更多內容盡在。
1. Everyone in our class was working hard and doing what we could _______ a good college.
A. enter B. to enter
C. entering D. entered
【陷阱】容易誤選A。有的同學一看到空格前的情態動詞 could 就斷定此處應填動詞原形 enter。
【分析】其實正確答案應是B。此句爲省略句，即在 could 後省略了動詞 do，若把句子補完整應爲Everyone in our class was working hard and doing what we could do to enter a good college。即句中的不定式短語(to enter a good college)是用作目的狀語的，而不是與情態動詞(could)一起構成謂語。請再看類似例句：
(1) They did what they could to comfort her. 他們儘量安慰她。
(2) They did everything they could to save her life. 他們盡一切力量拯救她的性命。
(3) He studies as hard as he could to catch up with his classmates. 他拼命學習以便趕上他的同學。
值得指出的是，這也並不是說今後只要遇到類似結構的題就一定選帶to不定式。請看以下試題：
(4) He ran as fast as he could _____ to catch the early bus.
A. to hope B. hope
C. hoping D. hoped
此題的答案是 C不是A，其中的現在分詞短語 hoping to catch the early bus 用作伴隨狀語。
(5) He spent every minute he could _____ spoken English.
A. practise B. to practise
C. practising D. practised
此題答案選 C，這與前面動詞 spent 的搭配有關，即 spend … (in) doing sth。若將此句補充完整，即爲 He spent every minute he could spend in practising spoken English.
(6) Before going abroad he devoted all he could ____D____ his oral English.
A. improve B. to improve
C. improving D. to improving
此題答案選D，注意兩點：一是 devote … to … 是固定搭配，意爲“把……貢獻給……”;二是其中的 to 是介詞，不是不定式符號，後接動詞時要用動名詞。
2. He knows nothing about it, so he can’t help _______ any of your work.
A. doing B. to do
C. being doing D. to be done
【陷阱】容易誤選B，根據 can’t help doing sth 這一結構推出。
【分析】其實答案應選A。比較以下結構：
can’t help to do sth = 不能幫助做某事
can’t help doing sth = 禁不住做某事，情不自禁地做某事
又如下面一題，答案也是 B：
She can’t help ____ the house because she’s busy making a cake.
A cleaning B. to clean
C. cleaned D. being cleaned
再請看以下試題：
While shopping, people sometimes can’t help _____ into buying something they don’t really need.
A. to persuade B. persuading
C. being persuaded D. be persuaded
此題應選C，句中的' can’t help 意爲“禁不住”(注意根據句意用被動形式)。
3. All her time _______ experiments, she has no time for films.
A. devoted to do B. devoted to doing
C. devoting to doing D. is devoted to doing
【陷阱】幾個干擾項均有可能誤選。
【分析】此題最佳答案爲B。現分析如下：
(1) devote 意爲“致力於，獻身於”，主要用 devote…to…或be devoted to，其中的to 是介詞，不是不定式符號，故後接動詞時要用動名詞，不用不定式。
(2) 選A錯誤：若將 do 改爲 doing 則可以。
(3) 選B正確：all her time devoted to doing experiments爲獨立主格結構，用作狀語。
(4) 選C錯誤：因爲all her time 與 devote 爲被動關係，故應將devoting改爲devoted。
(5) 選D錯誤：若單獨看 All her time is devoted to doing experiments，此句並沒有錯，但問題是逗號前後兩個簡單句沒有必要的連接方式，所以從整體上看仍不對，假若在後一句的句首加上and或so，則可選D，或將D將中的is 改爲 being也可選它。
英語語法經典例題800例：虛擬語氣（例題）
【導語】英語語法讓很多學生都頭疼，因爲複雜難懂的句式和詞組有時難以記憶。爲大家整理了英語語法大全，希望對同學們的英語語法學習有所幫助。更多內容盡在。
1. I forget where I read the article, or I _____ it to you now.
A. will show B. would show
C. am going to show D. am showing
【陷阱】幾個干擾項均有可能誤選。
【分析】正確答案選B。根據上文的語境可知句中的 or 隱含有一個虛擬的條件，即 or=if I didn’t forget where I read the article(要是我沒忘記我在哪兒讀過這篇文章的話——但事實上忘了)。
2. “It looks as if he were drunk.” “So it does. _____.”
A. He’d better give up drinking
B. He shouldn’t have drunk so much
C. Health is more important than drink
D. I wonder why he is always doing so
【陷阱】幾個干擾項均有可能誤選，主要是受句中 drunk 一詞的影響。
【分析】最佳答案爲D。關鍵信息是It looks as if he were drunk 中的虛擬語氣，句子既然用了虛擬語氣，也就是說，“他喝醉了”不是事實，只是他的言行好像是醉了，所以此題的最佳答案是D。
3. “Mary looks hot and dry” “So _____ you if you had so high a fever.”
A. do B. are
C. will D. would
【陷阱】容易誤選A或C。選A者，認爲前後兩句的動詞性質應一致;選C者，認爲其後帶有if 條件狀語從句，從語氣上看，主句應用將來時態。
【分析】此題最佳答案爲D。分析如下：
(1) “so + 助動詞 + 主語”是一個很有用的結構，它表示“……也一樣”時。如：
He likes to watch TV, and so do I. 他喜歡看電視，我也一樣。
When animals and plants disappear, so will man. 當動植物消失的時候，人類也會隨之消失。
(2) 由於空格後的 if 條件狀語從句的謂語用的是虛擬語氣(這是很重要的信息)，所以主句要用 would 而不用 will，即答案應選D。