if引導的什麼什麼句子，後麵跟什麼句型

真實條件句用於陳述語氣，假設的情況可能發生，其中 if 是如果的意思。

時態關係

句型：條件從句主句

一般現在時 shall/will + 動詞原形

If he comes, he will bring his violin.

典型例題

The volleyball match will be put off if it ___.

A. will rain B. rains C. rained D. is rained

答案B。真實條件句主句為將來時，從句用一般現在時。

注意：

1）在真實條件句中，主句不能用be going to表示將來，該用shall, will.

(錯) If you leave now, you are never going to regret it.

(對) If you leave now, you will never regret it.

2）表示真理時，主句謂語動詞便不用shall (will) +動詞原形，而直接用一般現在時的動詞形式。

16.2 非真實條件句

1）時態：可以表示過去，現在和將來的情況。它的基本特點是時態退後。

a. 同現在事實相反的假設。

句型：條件從句主句

一般過去時 should( would) +動詞原形

If they were here, they would help you.

b. 表示於過去事實相反的假設。

句型：條件從句主句

過去完成時 should(would) have+ 過去分詞

If she had worked harder, she would have succeeded.

The rice would not have been burnt if you had been more careful.

If my lawyer had been here last Saturday, he would have prevented me from going.

If he had come yesterday, I should / would have told him about it.

含義：He did not come yesterday, so I did not tell him about it.

If he had not been ill and missed many classes, he would have made greater progress.

含義： He was ill and missed many lessons, so he did not make greater progress.

c. 表示對將來的假想

句型：條件從句主句

一般過去時 should+ 動詞原形

were+ 不定式 would + 動詞原形

should+ 動詞原形

If you succeeded, everything would be all right.

If you should succeed, everything would be all right.

If you were to succeed, everything would be all right.

16.3 混合條件句

主句與從句的動作發生在不同的時間，這時主，從句謂語動詞的虛擬語氣形式因時間不同而不同，這叫做混合條件句。

If you had asked him yesterday, you would know what to do now.

（從句與過去事實相反，主句與現在事實相反。）

If it had rained last night (過去), it would be very cold today (現在).

16.4 虛擬條件句的倒裝

虛擬條件句的從句部分如果含有were, should, 或had, 可將if省略，再把were, should或had 移到從句句首，實行倒裝。

Were they here now, they could help us.

=If they were here now, they could help us.

Had you come earlier, you would have met him

=If you had come earlier, you would have met him.

Should it rain, the crops would be saved.

=Were it to rain, the crops would be saved.

注意：

在虛擬語氣的從句中，動詞’be’的過去時態一律用"were"，不用was，即在從句中be用were代替。

If I were you, I would go to look for him.

如果我是你，就會去找他。

If he were here, everything would be all right.

如果他在這兒，一切都會好的。

典型例題

_____ to do the work, I should do it some other day.

A. If were I B. I were C. Were I D. Was I

答案C. 在虛擬條件狀語中如果有were, should, had這三個詞，通常將if省略，主語提前, 變成 were, should, had +主語的形式。但要注意，在虛擬條件狀語從句中，省略連詞的倒裝形式的句首不能用動詞的縮略形式。如我們可說 Were I not to do., 而不能說 Weren’t I to do.

16.5 特殊的虛擬語氣詞：should

1） It is demanded / necessary / a pity + that…結構中的主語從句的謂語動詞要用should 加動詞原形， should 可省略。

句型：

(1)suggested

It is (2)important that…+ (should) do

(3) a pity

(1)suggested, ordered, proposed, required, demanded, requested, insisted； + (should) do

(2)important, necessary, natural, strange

a pity, a shame, no wonder

(3)It is suggested that we (should) hold a meeting next week.

It is necessary that he (should) come to our meeting tomorrow.

2）在賓語從句中的應用

在表示命令、建議、要求等一類動詞後麵的從句中。

order, suggest, propose, require, demand, request, insist, command, insist + (should) do

I suggest that we (should) hold a meeting next week.

He insisted that he (should ) be sent there.

注意：如suggest, insist不表示"建議" 或"堅持要某人做某事時"，即它們用於其本意"暗示、表明"、"堅持認為"時，賓語從句用陳述語氣。

The guard at gate insisted that everybody obey the rules.

判斷改錯:

（錯） You pale face suggests that you (should) be ill.

(對) Your pale face suggests that you are ill.

(錯) I insisted that you ( should) be wrong.

(對) I insisted that you were wrong.

3）在表語從句，同位語從句中的應用

在suggestion, proposal, idea, plan, order, advice等名詞後麵的表語從句、同位語從句中要用虛擬語氣，即（should）+動詞原形。

My idea is that we (should) get more people to attend the conference.

I make a proposal that we (should) hold a meeting next week.

有if引導的句子一定要虛擬麼？

1、可以虛擬也可以不虛擬，2、關於if的條件句：條件句可分為真實條件句和非真實條件句。

真實條件句表示句子所描述的事件是事實或在說話人看來可能實現的事情。

非真實條件句表示的條件與事實相反或不大可能實現的事情，即我們所說的虛擬語氣。

引導真實條件狀語從句的連詞和詞組有if, unless,once,as / so long as, so / as far as, in case, provided (that), providing (that), suppose (that), supposing (that),given (that),assuming (that),on condition (that)等。

3、虛擬語氣的使用範圍及判斷一、虛擬語氣表示一種不能實現的假設。

該語法主要用於if條件狀語從句。

也可用於主語從句、表語從句、賓語從句等。

二、if條件狀語從句中虛擬語氣的判斷判斷是真實條件句還是非真實條件句。

隻有在非真實條件句中才使用虛擬語氣。

通過句子意思，看假設的條件是否能夠實現，能夠實現是真實條件句，不能使用虛擬語氣；假設的條件不能實現則是非真實條件句，要用虛擬語氣。

判斷這個假設是與哪個事實相反。

通常有三種情況：①與過去事實相反。

②與現在事實相反。

③與將來事實可能相反。

三、“後退一步法”後退一步法是指在準確地判斷了該句與哪一事實相反後，按虛擬語氣的後退一步法處理從句謂語動詞的時態。

即：在非真實條件狀語從句中，謂語動詞按正常情況“後退一步”。

也就是：①與過去事實相反，在從句中用過去完成時形式表示。

②與現在事實相反，在從句中用過去一般時形式表示。

③與將來事實可能相反，在從句中用過去將來時形式表示。

主句中則用情態動詞would, should, could 等加一個與從句一致的動詞形式。

例：If I had come her yesterday, I would have seen him.If I were a teacher, I would be strict with my students.If it should snow tomorrow, they couldn't go out.四、注意事項①if條件句中如有were, should, had，可以省去if，並使用倒裝語序。

②在現代英語中if條件狀與從句中的謂語動詞如果是be其過去形式一般用were。

造10個由If引導的句子

其實你的問題很簡單，英語裏的語法規則沒有永恒的定律.一般情況下，if 引導的條件狀語從句是主將從現，沒說絕對哦！補充一點：“主將”指主句用一般將來時，過去將來時等都可； “從現”指從句用一般現在時，現在完成時等都可.英語作為一門語言，和漢語一樣，怎麼會有絕對一說，等你學多了，很多本身錯誤的語法都會被承認的！

請問if 引導的條件狀語從句有幾種形式

狀語從句：用一個句子（從句）來作另一個句子（主句）的狀語，用作狀語的句子就叫作狀語從句。

作什麼樣的狀語就叫什麼類型的狀語從句。

例如：條件狀語從句就是用一個句子來作條件狀語。

狀語從句的分類：（1）時間狀語從句凡是從句都必須有引導詞，引導時間狀語從句的詞有when,before,after,until,as soon as,while 等。

（2）條件狀語從句主要看一下由if引導的條件狀語從句。

if 意為“如果”，引導條件狀語從句時，表示假如有從句的動作發生就（不）會有主句的動作發生。

例如： If it doesn't rain tomorrow,we will go there by bike.如果明天不下雨，我們就騎自行車去那裏。

If I get there early,I can see the doctor quickly.如果我早早地到那裏，我就可以快點看病。

3）地點狀語從句用法要點常用where（哪裏）和wherever（無論哪裏）eg. Where there is a will,there is a way. 有誌者，事竟成。

We will go wherever the motherland need us most. 我們要到祖國最需要的地方去。

（4）原因狀語從句用法要點常用的引導連詞有because,as和since，三者的區別是：在回答問題的時候，使用because；對於顯而易見的原因，常用as或since;as和since的從句常放在主句之前，而because的從句常放在主句之後。

eg. Why did you go? I went because Tom told me to go. 你為何去？那是因為湯姆叫我去。

He was angry not because we were late but because we made a noise. 他很生氣不是因為我們來遲了，而是因為我們弄出了聲音。

As it was raining hard,we had to be indoors. 由於雨太大，我們隻好呆在家裏。

Since you feel ill,you'd better not go to work. 既然你感覺不舒服，你最好不要去上班了。

（5）目的狀語從句用法要點常用的引導連詞有so that,that和in order that譯為：以便，為了，目的是。

eg. Please speak more slowly so that we can make full notes. 請講慢一點，以便我們能作詳細筆記。

I shall write down your address that I may not forget. 我要把你的地址記下來，以免忘記。

I sent the letter by air mail in order that it might reach him in time. 這封信我以航空信發出，以便他能及時收到。

注：目的狀語從句可以用動詞不定式來替換做目的狀語。

eg. We work harder than usual finish it in a week. 我們比平常加倍努力工作以在一周內完成工作。

三、主句與從句時態一致的問題。

在時間狀語從句和條件狀語從句中，主句和從句之間的時態一致問題一般分下列兩種情況： 1. 若主句是祈使句，或主句中有情態動詞，或主句中謂語動詞是一般將來時，那麼從句用一般現在時表示一般將來時。

例如： Be careful when you cross the road. 過馬路時要小心。

Put up your hand if you have any questions to ask. 如果你們有問題要問的話，請舉手。

The traffic must stop when the lights are red. 紅燈亮時，車輛必須停下。

2. 若主從句謂語動詞都是陳述過去，那麼主從句都可以用一般過去時。

例如： She could sing when she was four years old. 她四歲的時候就會唱歌。

If 引導的條件狀語從句如何應用

展開全部狀語從句：用一個句子（從句）來作另一個句子（主句）的狀語，用作狀語的句子就叫作狀語從句。