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與將來(lái)事實(shí)相反的虛擬語(yǔ)氣

請(qǐng)看下面的題目：

If we __________ 200 years old，we __________ everything.

A. were to be，could change                                                 B. had been，changed

C. were，would have changed                                    D. should be，changed

此題應(yīng)選A。該題考查與將來(lái)事實(shí)相反的虛擬語(yǔ)氣，此時(shí)的主句謂語(yǔ)通常用would(should，could，might)＋動(dòng)詞原形，而從句謂語(yǔ)可能有以下幾種情況：

1. 從句謂語(yǔ)用過(guò)去式：

If your father knew this，he would be angry. 要是你父親知道了，他會(huì)生氣的。

If it rained tomorrow，the sports meet would beput off. 要是明天下雨，運(yùn)動(dòng)會(huì)就推遲。

2. 從句謂語(yǔ)用should+動(dòng)詞原形(通常指可能性極小的事情，一般譯為“萬(wàn)一”)：

If it should rain，the crops would be saved. 要是有雨，這莊稼還有救。

此類(lèi)句型的主句謂語(yǔ)有時(shí)可以用祈使句甚至將來(lái)時(shí)態(tài)：

If it should rain tomorrow，don’t expect me. 萬(wàn)一明天下雨，就不要等我了。

If I should be free tomorrow，I will come. 萬(wàn)一我明天有空，我就來(lái)。

3. 從句謂語(yǔ)用were to+動(dòng)詞原形 (通常指可能性極小可或近乎不可能，有時(shí)指出乎意料)：

If the sun were to rise in the west，my love for you would not change. 即使太陽(yáng)從西邊出，我對(duì)你的愛(ài)也不會(huì)變。