熱心網(wǎng)友

虛擬語(yǔ)氣是動(dòng)詞的一種特殊形式,用來(lái)表達(dá)說(shuō)話人的意愿。請(qǐng)求,設(shè)想,等未能或不可能實(shí)現(xiàn)的事實(shí),或說(shuō)話人看來(lái)實(shí)現(xiàn)可能性很小的情況。做這類題時(shí)首先要弄清楚虛擬語(yǔ)氣的各種句型,即由if引導(dǎo)的虛擬條件句,省略if的倒裝形式,可跟虛擬語(yǔ)氣的賓語(yǔ)從句,同位語(yǔ)從句,表語(yǔ)從句的句型,以及表示祝愿或感嘆的句子和由without, but for等介詞引導(dǎo)的短語(yǔ)或句子。(1)虛擬語(yǔ)氣現(xiàn)在時(shí)。 用以表示與現(xiàn)在事實(shí)相反的假設(shè)或現(xiàn)在實(shí)現(xiàn)可能性不大的情況。條件從句：動(dòng)詞過去式(be用were)主 句：Would/should/could/might + 動(dòng)詞原形Eg。 If I were a bird, I would fly to you。If it were not for their help, we should be in a very difficult position。(2) 虛擬語(yǔ)氣過去式。 表示與過去事實(shí)完全相反的假設(shè)。條件從句：had + 過去分詞主 句：would/should/could/might + have +過去分詞Eg。 If we had started earlier, we should not have missed the train。If she hadn’t been ill, she might have come。(3)虛擬語(yǔ)氣將來(lái)式。 表與將來(lái)情形相反的假設(shè)或極少有可能實(shí)現(xiàn)的情況。條件從句：動(dòng)詞過去式或should +動(dòng)詞原形或were to +動(dòng)詞原形主 句：would/should/could/might +動(dòng)詞原形Eg。 If Professor Li should have time tomorrow, we could ask him some questions。If there should be no air, there would be no living things。。