很多英語(yǔ)學(xué)習(xí)者都覺(jué)得If引導(dǎo)的條件狀語(yǔ)從句這個(gè)句型很難，學(xué)習(xí)起來(lái)很吃力。下面是學(xué)習(xí)啦小編為你整理的If引導(dǎo)的條件狀語(yǔ)從句的相關(guān)資料，希望大家喜歡!

　　If引導(dǎo)的條件狀語(yǔ)從句用法

　　1.if引導(dǎo)的條件狀語(yǔ)從句可以放在主句之前，也可以放在主句之后，如果放在主句之前，中間要用逗號(hào)將主句和從句隔開(kāi)。

　　例如：

　　If I am free, I will come to see you.

　　= I will come to see you if I am free.

　　如果我有空，我就來(lái)看你。

　　2. 在含if引導(dǎo)的條件狀語(yǔ)從句的復(fù)合句中，主句用一般將來(lái)時(shí)，從句通常用一般現(xiàn)在時(shí)態(tài)表示將來(lái)意義，即“主將從現(xiàn)”原則。

　　例如：

　　If it snows tomorrow, we will go skiing.

　　如果明天下雪，我們就去滑雪。

　　3. 在含if引導(dǎo)的條件狀語(yǔ)從句的復(fù)合句中，語(yǔ)句的謂語(yǔ)還可含有情態(tài)動(dòng)詞can、must、may等，主句也可是祈使句。

　　例如：

　　If it stops raining, we can go out.

　　如果雨停了，我們就能出去。

　　4. 在含if引導(dǎo)的條件狀語(yǔ)從句的復(fù)合句中，如果主句部分描述的是客觀事實(shí)或真理，要用一般現(xiàn)在時(shí)。

　　例如：

　　If you heat the ice, it turns into water.

　　如果你加熱冰，它就會(huì)變成水。

　　if引導(dǎo)的非真實(shí)條件句

　　對(duì)過(guò)去的虛擬

　　條件從句(if):主語(yǔ)+had done 主句might/would/should/could+have done

　　對(duì)現(xiàn)在的虛擬

　　if+ 主語(yǔ)+動(dòng)詞過(guò)去式(be用were)主句 might/would/should/could+do

　　對(duì)將來(lái)的虛擬

　　if+主語(yǔ)+動(dòng)詞過(guò)去式(be用were)或主語(yǔ)+should do或主語(yǔ)+were to do

　　主句 might/would/should/could+do

　　e.g.

　　Tom got to the station in time because he started earlier.

　　If Tom had started late, he would have missed the train.

　　Do you think the thief entered through the door?

　　No, if he had, I don't believe, he would have broken the living room window.

　　If the book weren't so expensive, I would buy it.

　　If you didn't live so far away, we would be able to visit you more.

　　What would you do if you lost your passport in a foreign country?

　　Why hasn't he come? If he should not come on time, we would have to put off the trip.

　　2.注意事項(xiàng)

　　e.g.

　　If she hadn't work hard at English in the past, she wouldn't work as well as a secretary in a large company now. 混合時(shí)間的虛擬語(yǔ)氣 從句為對(duì)過(guò)去的虛擬，主句是現(xiàn)在。

　　Had we not used an out-of-date timetable, we wouldn't have missed the train.

　　if引導(dǎo)從句的倒裝從句相當(dāng)于 if we had not used an out-of-date timetable, 同樣，were還有should 在從句中都可以提前，省略if.

　　If only 要是...就好了

　　If only I were younger!

　　If only I had worked harder in my teenage years!

　　If only I should travel tomorrow!

　　虛擬語(yǔ)氣的十大句型

　　一、虛擬條件句：

　　條件狀語(yǔ)從句是非真實(shí)情況，在這種情況下要用虛擬語(yǔ)氣。

　　1.條件從句與現(xiàn)在事實(shí)不一致，其句型為：

　　句型1：If +主語(yǔ)+過(guò)去時(shí)，主語(yǔ)+ should (could, would, 或might) +動(dòng)詞原形

　　(1) If I were you, I would study hard.

　　(2) If it rained, I would not be here now.

　　2.條件從句與過(guò)去事實(shí)不一致，其句型為：

　　句型2：If +主語(yǔ)+had+過(guò)去分詞，主語(yǔ)+ should(could, would, 或might)+ have +過(guò)去分詞

　　(3) If the doctor had come last night, the boy would have been saved.

　　(4) If I had not studied hard, I would have failed in the exam last term.

　　3.條件從句與將來(lái)事實(shí)不一致，其句型為：

　　句型3：If +主語(yǔ)+過(guò)去時(shí)/ should +動(dòng)詞原形/ were to+動(dòng)詞原形，主語(yǔ)+ should (could, would, 或might) +動(dòng)詞原形

　　(5) If it should rain tomorrow, we would stay at home.

　　(6) If I were to go to the moon one day, I could see it with my own eyes.

　　(7) If you missed the film tonight, you would feel sorry.

　　注意問(wèn)題：

　　1.If條件句中絕對(duì)不可以出現(xiàn)would。

　　2.根據(jù)句中的時(shí)間狀語(yǔ)，有時(shí)可能出現(xiàn)“混合虛擬”的情況，即主句可能是現(xiàn)在的情況，條件句也許是發(fā)生在過(guò)去的情況，但都要遵守上述句型。如：

　　(8) If you had studied hard before, you would be a college student now and you would graduate from a college in four years’ time.

　　3.條件句中如果出現(xiàn)were, had, should可省去if，將主語(yǔ)與這些詞倒裝。例如：

　　(9) Had the doctor come last night, the boy would have been saved.

　　(10) Were I to go to the moon one day, I would see it with my own eyes.

　　(11) Should it rain tomorrow, we would stay at home.

　　二、名詞性虛擬語(yǔ)氣：

　　在表示命令、建議、要求、驚嘆時(shí)的名詞性從句中需用虛擬語(yǔ)氣，基本句型：

　　句型4：主語(yǔ)+(should)+動(dòng)詞原形

　　(12) Mother insisted that John (should) go to bed at 9 o’clock.(賓語(yǔ)從句)

　　(13) It was required that the crops (should) be harvested at once.(主語(yǔ)從句)

　　(14) It is surprising that she shouldn’t pass the math exam. (主語(yǔ)從句)

　　(15) The suggestion that he (should) be invited was rejected.(同位語(yǔ)從句)

　　(16) Their demand is that their wages (should) be increased.(表語(yǔ)從句)

　　注意：在這種句子中絕不可以出現(xiàn)would, must, could等。

　　三、虛擬語(yǔ)氣在一些特殊詞中的使用或含蓄條件句：

　　句型5：wish后的賓語(yǔ)從句

　　與現(xiàn)在愿望不一致：主語(yǔ)+過(guò)去時(shí);

　　與過(guò)去愿望不一致：主語(yǔ)+ had +過(guò)去分詞 / could + have +過(guò)去分詞;

　　與未來(lái)愿望不一致：主語(yǔ)+ would / could +動(dòng)詞原形。如;

　　(17) I wish I were you.

　　(18) I wish I had visited the White House when I was in the States.

　　(19) I wish I could meet you tomorrow at the party.

　　句型6：It’s time句型(當(dāng)It’s time后用that從句時(shí)應(yīng)該為“主語(yǔ)+ should +動(dòng)詞原形”或“主語(yǔ)+過(guò)去時(shí)”)

　　(20) It’s time that you went / should go to school.

　　句型7：If only引起的感嘆句相當(dāng)于“How I wish +賓語(yǔ)從句”

　　(21) If only he could come! 他要能來(lái)就好了。

　　(22) If only I had known the answer! 我要早知答案就好了。

　　句型8：would rather, as if(though)引導(dǎo)的句子也需使用虛擬，表示過(guò)去的情況用過(guò)去完成時(shí)，表示現(xiàn)在與將來(lái)的情況

　　用過(guò)去時(shí)。

　　(23) I’d rather you posted the letter right away.

　　(24) I’d rather you had returned the book yesterday.

　　(25) She loves the children as if they were hers.

　　(26) Alan talked about Rome as if he had been there.

　　句型9：without, but, but for, but that, otherwise引起的短語(yǔ)或句子常暗含著虛擬條件。

　　(27) Without you, I would never know him.

　　(28) But for your cooperation, we wouldn’t have done the work so well.

　　(29) But that she was afraid, she would have said no.

　　(30) I would be most glad to help you, but I’ am busy now.

　　(31) I should have come to the party yesterday, but I was busy.

　　(32) I am busy now; otherwise I would do you the favor!

　　句型10：If it were not for ... / If it hadn’t been for ... (要不是因?yàn)?hellip;…)，其后面的主句也需使用虛擬。

　　(33) If it were not for his help, I wouldn’t go home now.

　　(34) If it hadn’t been for the determined captain, all the passengers on the board wouldn’t have been saved.