He daren't speak English before such a crowd,dare he?
8.ought to的用法 ought to表示“应该”(与should同义,只是语气稍重一些),也可表示推测。如: You ought to take care of him. He ought to be home by now. 9.used to的用法 表示过去的习惯动作或状态(暗含现在已不如此)。如: -Did you use to go there to see your brother?/ Used you to go there to see your brother? -Yes,I did(used to)./No,I didn't(usedn't). 10.had better的用法 表示“最好(做……)”。如: We had better go now. Breakfast had better be eaten before 8 o'clock. 三、虚拟语气要点归纳
1.虚拟语气在虚拟条件句中的运用 (1)时态及其构成 if 条件从句 从句的谓语形式 主句的谓语形式 表示现在情况 动词过去式(be的过去式用were) should/would/could/might+动词原形 表示过去 情况 had+过去分词 should/would/could/might+have+过去分词 表示未来情况 should+动词原形 should/would/ could/might +动词原形
动词过去式 were to+动词原形 (2)表示与现在事实完全相反的假设 用以表示与现在事实相反的假设或现在实现可能性不大的情况。条件从句用动词过去式(be用were),主句用“would/should/could/might+动词原形”。如: If I were a bird,I could fly. 如果我是一只鸟儿的话,我就能飞了。 (3)表示与过去事实完全相反的假设 条件从句用“had+过去分词”,主句用“would/should/could/might+have+过去分词”。如: If we had started earlier,we should not have missed the train. 如果我们早点出发,就不会错过这列火车了。 (4)表示与将来情形相反的假设或极少有可能实现的情况 条件从句用动词过去式或should+动词原形或were to+动词原形,主句动词用would/should/could/might+动词原形。如: If Professor Li should have time tomorrow,we could ask him questions.
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