【正文】 ld the boy e again, I would throw him out. 要是那男孩在來，我就把他攆出去。 If it should rain, our plan would be spoiled. 萬一下雨，我們的計劃就泡湯了。 Should that be true, the contract would be canceled. 假如那是真的，合約就該取消。 Should another world war break out, what would bee of human beings? 萬一另一次世界大戰(zhàn)爆發(fā)，人類將會發(fā)生什么事？If I were to ..., I ...結(jié)構(gòu)︰If…were to…，…would／should 等＋原形動詞說明︰這也是表示與未來狀況相反的假設(shè)句型，與“if ... should, ...”大致相同，但“if ... were to”所表示的可能性更低，通常用以表示“與真理相反”的假設(shè)語氣。 If the sun were to rise in the west, he would pass the exam. 要是太陽從西邊出來，他就會通過考試－－他不可能通過考試。 If I were to be born again, I would like to be a bird. 我要是再活一次，我想當(dāng)一只鳥。 If the sun were to disappear, what would the earth be like? 萬一太陽消失了，地球會變成什么樣子？ Were I to die tomorrow, what would my children do? 萬一明天我死了，我的孩子們將怎么辦呢？If I + Ved, I would ...結(jié)構(gòu)︰If…＋過去式動詞…，主詞＋過去式助動詞（would／should 等）＋原形動詞說明︰這是與現(xiàn)在事實相反的假設(shè)句型。if 子句中的be動詞，不論主詞為第幾人稱，一律用 were，were 可置于主詞前面，而省略 if。過去式助動詞除用 should（用于第一人稱）、 would（用于第二、三人稱）外，還可用不分人稱的 could，might 和 ought to，它們與動詞原形結(jié)合起來構(gòu)成假設(shè)語氣。 If I knew his address, I could write to him. 如果我知道他的住址，我會寫信給他。 If I were free now, I might call on him. 如果我有時間，我可能會去看他。 If you were in my shoes (=Were you in my shoes), what would you do? 如果你站在我的立場，你會怎么做？ Were I rich enough, I would buy a sports car. 如果我有足夠的錢，我就買一輛賽車了。 How happy I would be if I were a few inches taller! 要是我再高幾寸，我會好高興。 If I had a car, I could take her for a drive. 如果我有車， 我就帶她去兜風(fēng)了。 If I had binoculars, I could see that et clearly. 如果我有望遠(yuǎn)鏡，我就可以清楚地看見那顆彗星。It is time that ...結(jié)構(gòu)︰It is（high）time＋（that）＋主詞＋過去式動詞說明︰此句型意為“已經(jīng)到了…的時間了”。過去式動詞處有時亦使用“should＋動詞原形”。that 子句也能用 to 不定詞來表示。 It is time he went to bed. 該是他睡覺的時間了。 It is time that you left for the duty. 該你當(dāng)班了。 It is time that you reflected upon your mistakes. 該是你反省思過的時候了。 It is high time he should e to our house for 。 It is time for somebody to teach you to behave yourself. 該是有人教你應(yīng)對進(jìn)退之禮儀的時候了。If I had Ved, I would have ...結(jié)構(gòu)︰If…h(huán)ad＋過去分詞…，主詞＋would／should 等＋have＋過去分詞說明︰這是與過去事實相反的假設(shè)句型。if 子句要用過去完成式，主要子句則要用過去式助動詞（would，should，ought to，might，could）＋have＋過去分詞。if 子句中的 had可置于主詞前面，而省略 If。 If I had seen him, I would have told him the truth. 如果我當(dāng)時看見他，我會告訴他實情。 I could have finished the task if I had had more time.如果當(dāng)時我能有多一點時間，我就能完成這項任務(wù)。 If we had known of your departure, we would have seen you off at the airport. 如果我們事先知道你要離開，我們會到機(jī)場送行。 I someone had been with him, he might not have been drowned. 如果有人在他旁邊，或許他就不會溺死。 I might have been incredulous had I not been accustomed to such responses. 若非我已經(jīng)習(xí)慣了這樣的回答，我可能不敢輕易相信。 Had he not apologize to her, she would not have forgiven him. 她（那時）不會原諒他，若非他道了歉。 Had he not saved me, I might have been drowned. 我可能溺死了，若非他救了我。 Had I proposed to you, would you have married me?我要是當(dāng)年向你求婚，你會答應(yīng)嫁給我嗎? Had you not helped us, we should have canceled this transaction. 假如沒有你的幫助，這筆生意早就告吹了。If I had Ved, I would ...結(jié)構(gòu)︰If…h(huán)ad＋過去分詞…，主詞＋would／should 等＋原形動詞＋now／today說明︰這是時態(tài)不一致時的假設(shè)句型，亦稱混合假設(shè)條件句。即：if 子句若與過去事實相反，用過去完成式表示；而主要子句若與現(xiàn)在事實相反，則用過去式助動詞表示。此類主要子句句尾通常有表現(xiàn)在的時間副詞，如 now，today 等。 If he had worked harder when young, he would be well off now. 如果他年輕時多努力一點，現(xiàn)在就能過得舒服些。 If I had been rich ten years ago, I could buy that house today. 如果十年前我有錢，今天我就能買下那棟房子了。 Had he told the truth, he wouldn’t be punished ，現(xiàn)在就不會受罪了。 Had he followed the doctor’s advice, he might be alive now. 當(dāng)時他要是聽了醫(yī)生的建議，現(xiàn)在可能還活著。I wish ... + Ved ...結(jié)構(gòu)︰I wish＋（that）＋主詞＋動詞過去式／過去完成式（had＋過去分詞）…說明︰I wish 之后以 that 子句為受詞時，該子句的動詞一定要用假設(shè)語氣：若動詞用過去式，表示與現(xiàn)在事實相反的愿望；若用過去完成式，則表示與過去事實相反的愿望。“I wish＋that子句”的句型也可用“I would rather＋that子句”取代。而 I hope 之后以 that 子句做受詞時，該子句用一般時態(tài)。 I wish there were meadows and lambs. 但愿有草地與小羊。 I wish I were as tall as you. 但愿我像你一樣高。 I wish he could tell us. 但愿他能告訴我們。 I wish (=I would rather) he could e tomorrow. 但愿他明天能來。 I wish you had not been caught in the rain yesterday. 但愿昨天你們沒有淋到雨。 I wish you had not told the truth. 但愿你沒有說實話。 I wish I had known you ten years ago. 真希望十年前就已經(jīng)認(rèn)識你。If only + Ved結(jié)構(gòu)︰If only＋過去式／過去完成式說明︰此句型意為“要是…就好了?！庇眠^去式，表示與現(xiàn)在事實相反；若用過去完成式，則表示與過去事實相反。 If only I had a rich father. 要是我有個有錢的爸爸就好了。 If only he had been here. 要是他當(dāng)時在這兒就好了。 If only I had another chance. 要是我再有一次機(jī)會就好了。... as if/as though ...結(jié)構(gòu)︰…as if／as though…現(xiàn)在式／過去式／過去完成式說明︰此句型意為“彷佛…；好像…一樣”。as if，as though 是副詞連接詞，引導(dǎo)副詞子句。子句中，可用現(xiàn)在式，以表示事實；也可用過去式或過去完成式，分別表示與現(xiàn)在或過去事實相反的假設(shè)語氣。 He speaks like that as if he doesn’t want to attend the ，似乎不想?yún)⒓訒h。 He walks as if he is drunk. 他走起路來好像他真的醉了。 He felt as if he almost wished to kill them. 他感覺彷佛幾乎要殺掉他們。 The baby opened the book as if he were able to read. 這個嬰兒打開書本彷佛他會念書。 The nurse attends on the patient as if he were her father. 這護(hù)士照顧這位病人彷佛在照顧她爸爸似的。 He ran into the room as if he had seen something terrible. 他跑進(jìn)屋子，彷佛他看到什么可怕的東西。 She looks as if nothing had happened to her. 她當(dāng)時看起來好像什么事都沒發(fā)生似的。It seems/looks as if ...結(jié)構(gòu)︰It seems／looks as if…說明︰此句型意為“似乎…”。本句型中的 as if 子句可用以表示事實，或假設(shè)語氣。 It looks as if it is going to rain. 好像要下雨了。 It seems as if he knows everything. 他似乎是個萬事通。 It seems as if he knew everything, but in reality, he is as stupid as can be. 他似乎是個萬事通。其實他是再愚蠢不過了。 It looks as if she had just e back from outer space. 她看起來彷佛剛從外層空間回來似的。 It seemed as if he had finished the work. 他似乎已經(jīng)完成了這個工作。 It seemed as if he would never finish the work. 他似乎永遠(yuǎn)完成不了這個工作。If it were not for ...結(jié)構(gòu)︰if it were not for＋名詞／子句，主詞＋would／should 等＋原形動詞…說明︰此句型意為“若非（有）…”。此類句構(gòu)專門用于表示與現(xiàn)在事實相反的假設(shè)語氣。亦可用“but for＋名詞”或“without＋名詞”代替。were 可以提前，省略 if，如例句3。 If it were not for his presence, I would punish you. 要不是他在場，我會處罰你的。 But for your advice, I should have failed. 要不是你的忠告，我會失敗的。 But for music (=Were it n