2020屆高考英語二輪 非謂語動詞教案
a. enter b. to enter c. entering d. entered
陷阱：容易誤選a。有的同學(xué)一看到空格前的情態(tài)動詞 could 就斷定此處應(yīng)填動詞原形 enter。
分析：其實正確答案應(yīng)是b。此句為省略句，即在 could 后省略了動詞 do，若把句子補完整應(yīng)為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(tài)動詞（could）一起構(gòu)成謂語。請再看類似例句：
（1） they did what they could to comfort her. 他們盡量安慰她。
（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(xué)習(xí)以便趕上他的同學(xué)。
值得指出的是，這也并不是說今后只要遇到類似結(jié)構(gòu)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(xiàn)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 practice c. practising d. practised
此題答案選 c，這與前面動詞 spent 的搭配有關(guān)，即 spend … （in） doing sth。若將此句補充完整，即為 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，意為“把……貢獻給……”；二是其中的 to 是介詞，不是不定式符號，后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(jù) can’t help doing sth 這一結(jié)構(gòu)推出。