2020屆高考英語二輪 非謂語動詞教案
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 意為“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：此題最佳答案為b。現分析如下：
（1） devote 意為“致力于，獻身于”，主要用 devote…to…或be devoted to，其中的to 是介詞，不是不定式符號，故后接動詞時要用動名詞，不用不定式。
（2） 選a錯誤：若將 do 改為 doing 則可以。
（3） 選b正確：all her time devoted to doing experiments為獨立主格結構，用作狀語。
（4） 選c錯誤：因為all her time 與 devote 為被動關系，故應將devoting改為devoted。
（5） 選d錯誤：若單獨看 all her time is devoted to doing experiments，此句并沒有錯，但問題是逗號前后兩個簡單句沒有必要的連接方式，所以從整體上看仍不對，假若在后一句的句首加上and或so，則可選d，或將d將中的is 改為 being也可選它。
請做以下類似題（答案均選a）：
（1） all the preparations for the project ______, we’re ready to start.
a. completed b. have been completed c. had been completed d. been completed
（2） such _______ the case, i couldn’t help but______ him.
a. being, support b. was, support c. has been, supporting d. is, to support
比較以下各題，答案選b，因為句中使用了并列連詞and：
（1） all the preparations for the project ______, and we’re ready to start.
a. completed b. have been completed c. had been completed d. been completed
（2） such _______ the case, i couldn’t help but______ him.
a. being, support b. was, support c. has been, supporting d. is, to support