摘要：表示与将来事实相反的情况时, if从句的谓语形式是: ①.完全动词过去式 ; ②.should +动词原形; ③.were to do. 其中②, ③种情况都含有“出乎意料之外 之意; 主句的谓语的形式是: should / would / could / might +动词原形 a. If she should invite me tomorrow, I should go to the party. b. If it rained / should rain / were to rain tomorrow, our picnic would be put off. c. If I saw him tomorrow, I would pass your note to him. d. I might come back if I were to miss the train.

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