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    如何正確使用虛擬語氣倒裝形式？
    請看典型考題：
    __________ your address，I would have written to you.
    A. Did I know                                        B. Were I to know
    C. Had I known                                      D. If I should know
    此題應(yīng)選 C。這是虛擬語氣的倒裝形式。當(dāng)虛擬條件句中含有 were，had，should，could等動詞時，可以將if省略，然后將 were，had，should，could 等詞移至句首：
    1. If he should fail，he would kill himself.
    →Should he fail，he would kill himself.
    萬一失敗，他就會自殺。
    2. If I were you，I would do it at once.
    →Were I you，I would do it at once.
    假若我是你，我就會馬上做。
    3. If I could do it，I would.
    →Could I do it，I would.
    要是我能做此事，我一定會做。
    4. If he had seen you yesterday，he would haveasked you about it.
    →Had he seen you yesterday，he would haveasked you about it.
    他昨天要是看到了你，他就會問你這事了。
    順便說一句，以上移至句首的 had不一定是助動詞，如果是實義動詞也可倒裝：
    If he had money，he would buy a car.
    →Had he money，he would buy a car.
    他要是有錢，他就會買一輛小車。