一、如果what if是對(duì)現(xiàn)在情況的表達(dá),不用虛擬語氣,就用一般現(xiàn)在時(shí)【你的例句一】二、如果what if后面是對(duì)過去、將來的推測(cè)、假設(shè),需要用虛擬語氣1、如果表示對(duì)將來的推測(cè) 有這幾種用法：①if+主語+were ...方便解釋一下，虛擬語氣嗎Subjunctive Mood (虛擬語氣)非真實(shí)條件句的虛擬：(if從句比正常情況提前一個(gè)時(shí)態(tài))(Ls. 15-16) It wouldn't be so bad if he’d let a taxman work on the forms with him, but he insists on doing it himself…與現(xiàn)在事實(shí)相反： if用過去式或用should/were to 表示更小的可能性，主句用should/would/could/might＋不定式。 I would have thought they were city fellows if I hadn’t seen the flying saucer stepped in.與過去事實(shí)相反： if用過去完成式（had+done），主句用should/would/could/might+have done (完成體)請(qǐng)多給我一點(diǎn)what if 的例句。what happens if there is not any water in the earth.如果地球上沒有水了怎么辦？What happens if Tom doesn't pass the exam?湯姆如果考試不及格，會(huì)怎么樣？祝你進(jìn)步vwhat if 主語 should 的例句有嗎?