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1、1. if 条件状语从句中的虚拟语气一、if 条件状语从句中表示对将来、过去、现在的虚拟1.if she invites me tomorrow,i shall go to the party.(真实条件句)如果她明天邀请我参加聚会,我就去.if she .一、if 条件状语从句中表示对将来、过去、现在的虚拟1. If she invites me tomorrow, I shall go to the party.（真实条件句）如果她明天邀请我参加聚会,我就去.If she invited me , I should go to the party.虚拟条件句 (说话人认为邀请的可能性较小或
2、不可能)She will probably not invite me, so I shall not go to the party.2. If she had invited me yesterday, I should have gone to the party. 假如她昨天邀请我参加聚会,我就去了.She didnt invite me yesterday, so I didnt go to the party. 她昨天没有邀请我参加聚会,因此我没有去.3. If she should invite me tomorrow, I should go to the party.If s
3、he were to invite me tomorrow, I should go to the party.If she invited me tomorrow, I should go to the party.1.对现在的虚拟条件状语从句的动词形式 主句的动词形式If+主语+动词过去式(be的过去式用were) I (we) should+动词原形主语+would(might, could)+动词原形If I were you, I should study English. (I am not you , so I shall not study English.)If I had
4、time, I would attend the wedding. (I does not have time, so I will not attend the wedding.)If they didnt take physical exercises every day, they wouldnt be so healthy.(They take physical exercises every day, so they are very healthy.)2.对过去的虚拟条件状语从句的动词形式 主句的动词形式If+主语+had+过去分词 I(we) should+ have+过去分词主
5、语+would(might, could)+have+过去分词If you had taken my advice, you wouldnt have failed in the examination.(You did not take my advice, so you have failed in the examination.)3.对将来的虚拟条件状语从句的动词形式(三种) 主句的动词形式If+主语+动词过去式(be的过去式用were),通常要与一个表示将来的时间状语连用(tomorrow)If+主语(任何人称和数)+should+动词原形If+主语(任何人称和数) +were +to动词原形I (we) should+动词原形或主语(任何人称)+would(might, could)+动词原形If it rained tomorrow, our picnic would be put off.If it should rain tomorrow, our picnic would be put off.If it were to rain tomorrow, our picnic would be put off.