与现在事实相反 一般过去时(be用were) would/should/could/might+动词原形
与将来事实相反 一般过去时或should(were to)+动词原形 would/should/could/might+动词原形
注意:有时候在使用时可省略if,句子则可换成下列形式,即“were/had/should+主语”。
Were I a boy,I would join the army.
Had he taken my advice,he would have succeeded.
Were it not for the expense,I would go to Britain.
2.虚拟语气用于名词性从句
(1)虚拟语气在宾语从句中的运用。
①“wish+宾语从句”表示不能实现的愿望,译为“要是……就好了”等。表示现在不能实现的愿望,从句中的谓语动词用一般过去时;表示将来不能实现的愿望,从句中的谓语动词用“would/could+动词原形”;表示过去不能实现的愿望,从句中的谓语动词用“had+过去分词”或“could (should)+have+过去分词”。
I wish it were spring all the year round.
I wish I had known the answer.
②在表示建议、要求、命令等的动词suggest、advise、propose、demand、require、insist、request、command、order等后的宾语从句中,谓语动词用should+动词原形或是动词原形。
The doctor ordered she should be operated.
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