time tomorrow, I would teach you how to play the piano.
A.Had I hadB.If I would haveC.If I haveD.Were I to have
D

試題分析:對將來情況的虛擬,謂語動詞可用should do, were to do或動詞的過去式三種形式表示,但意義略有不同。should表示的可能性最大,動詞過去式的可能性次之,were to do 的可能性最小。虛擬條件句中有had, should, were時,可以將if去掉,然后把had, should, were提到主語前面。
點評:虛擬條件句往往指不能實現(xiàn)或純假想的情況,可以對過去、現(xiàn)在或?qū)磉M行假想。虛擬語氣的本質(zhì)就是對根本不可能的情況發(fā)生假設(shè)。我們可以記住這樣一個原則,即把時態(tài)向過去推一格。對現(xiàn)在情況的虛擬,條件從句中謂語動詞用一般過去式,主句用“would/should/might /could+動詞原形”形式,表示對現(xiàn)在不可能實現(xiàn)情況的假想;對過去情況的虛擬,條件從句中謂語動詞用過去完成式,主語用“would/could/should/might + have+動詞的過去分詞”形式;對將來情況的虛擬,在表示與將來事實相反的條件從句中,謂語動詞可用should do, were to do或動詞的過去式三種形式表示,但意義略有不同。should表示的可能性最大,動詞過去式的可能性次之,were to do 的可能性最小。
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