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【請看題目】
_________ is hard is to do good all one’s life and never do anything bad.
A. He B. It C. That D. What
【瞧瞧分析】
此題容易誤選B，認為這是考查形式主語。其實，此題的正確答案是D，句首的 What is hard 是主語從句，注意 what is hard 后的謂語動詞 is。假若沒有此 is，則應選B，即說成 It is hard to do good all one's life and never do anything bad.
【舉一反三】
請做以下類似試題(答案均為C)：
(1) a. _________ is difficult to persuade her to stay.
b. _________ is difficult is to persuade her to stay.
A. It, It B. What, What C. It, What D. What, It
(2) a. _________ is interesting to watch children play games.
b. _________ is interesting is to watch children play games.
A. It, It B. What, What C. It, What D. What, It
(3) a. _________ is dangerous to play with fire.
b. _________ is dangerous is to play with fire.
A. It, It B. What, What C. It, What D. What, It
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