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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(shí)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。