If it were not for

　　結構︰if it were not for+名詞/子句，主詞+would/should 等+原形動詞

　　說明︰此句型意為若非。此類句構專門用于表示與現在事實相反的假設語氣.亦可用but for+名詞或without+名詞代替。were 可以提前，省略 if，如例句3.

　　If it were not for his presence, I would punish you.

　　要不是他在場，我會處罰你的。

　　But for your advice, I should have failed.

　　要不是你的忠告，我會失敗的。

　　But for music , life would be dull.

　　要不是音樂，人生會很無聊。

　　If it were not for oxygen and nitrogen in the air, no man could live on the earth.

　　大氣中如果沒有氧和氮，人就無法生存于地球了。

　　Without air, all living things would die.

　　若非空氣，所有的生物都會死亡。

　　Without newspaper, we would get behind the times.

　　要不是報紙，我們都趕不上時代了。

　　I should be lonely, were it not for the birds and the flowers.

　　我會寂寞，若非有鳥也有花。

　　Were it not for his help, I could not finish the work.

　　若非有他的幫助，我就不能完成這件工作。

　　Were it not for science, we could not live a comfortable live.

　　若非科學，我們無法過著舒適的生活。

　　If it were not for

　　結構︰if it were not for+名詞/子句，主詞+would/should 等+原形動詞

　　說明︰此句型意為若非。此類句構專門用于表示與現在事實相反的假設語氣.亦可用but for+名詞或without+名詞代替。were 可以提前，省略 if，如例句3.

　　If it were not for his presence, I would punish you.

　　要不是他在場，我會處罰你的。

　　But for your advice, I should have failed.

　　要不是你的忠告，我會失敗的。

　　But for music , life would be dull.

　　要不是音樂，人生會很無聊。

　　If it were not for oxygen and nitrogen in the air, no man could live on the earth.

　　大氣中如果沒有氧和氮，人就無法生存于地球了。

　　Without air, all living things would die.

　　若非空氣，所有的生物都會死亡。

　　Without newspaper, we would get behind the times.

　　要不是報紙，我們都趕不上時代了。

　　I should be lonely, were it not for the birds and the flowers.

　　我會寂寞，若非有鳥也有花。

　　Were it not for his help, I could not finish the work.

　　若非有他的幫助，我就不能完成這件工作。

　　Were it not for science, we could not live a comfortable live.

　　若非科學，我們無法過著舒適的生活。