(3) 當虛擬條件句的謂語動詞含有 were, should, had 時，if 可省略，而將 were, should, had等詞置于句首。如：

Should he agree to go there, we would send him there. 要是他答應去的話，我們就派他去。

Were she here, she would agree with us. 如果她在這兒的話，她會同意我們的。

Had he learnt about computers, we would have hired him to work here. 如果她懂一些電腦知識的話，我們會已經聘用他來這里工作了(from www.hz123456.com)。

(4) 有時，句子沒有直接給出假設情況的條件，而須通過上下文或其他方式來判斷。如：

I would have come to see you, but I was too busy. 我本該來看你了，然而我太忙了。

But for his help, we would be working now. 要不是他的幫助，我們還會在工作呢。

Without your instruction, I would not have made such great progress. 要是沒有你的指導，我不會取得如此大的進步。

(5) 有時，虛擬條件句中，主、從句可以省略其中的一個，來表示說話人的一種強烈的感情。

①省略從句

He would have finished it. 他本該完成了。

You could have passed this exam. 你應該會通過這次考試了。

②省略主句

If I were at home now. 要是我現在在家里該多好啊。

If only I had got it. 要是我得到它了該多好啊。

二、其他狀語從句的虛擬語氣

1. 目的狀語從句中的虛擬語氣

(1) 在 for fear that, in case, lest 引導的目的狀語從句中，若用虛擬語氣時，從句謂語為： should + 動詞原形。并且 should 不能省略

She examined the door again for fear that a thief should come in. 她又把門檢查了一遍，以防盜賊的進入。

He started out earlier lest he should be late. 他很早就出發了以防遲到。

(2) 在 so that, in order that 所引導的目的狀語從句中，從句中的謂語為：can / may / could / might / will / would / should + 動詞原形。如(from www.hz123456.com)：

He goes closer to the speaker so that he can hear him clearer. 他走近說話的人以便能挺得更清楚。

He read the letter carefully in order that he should not miss a word. 他把信讀得很仔細以便不漏掉一個單詞。

2. 讓步狀語從句中的虛擬語氣

(1) 在 even if, even though 所引導的讓步狀語從句中，可用虛擬語氣，主句、從句的結構與 if 所引導的條件從句結構相同。如：

Even if he were here himself, he should not know what to do. 即使他親自來也不知該怎么辦。

Nobody could save him even though Hua Tuo should come here. 即使華佗在世也救不了他。

(2) 在whatever, whichever, whenever, whoever, wherever, however, no matter wh-word 等引導的讓步狀語從句中，從句虛擬語氣結構為：

① may +動詞原形(指現在或將來)。如：

We will finish it on time no matter what / whatever may happen. 不管發生什么事，我們都要按時完成。

We will find him wherever / no matter where he may be. 無論他在哪里，我們都要找到他。

I will wait for him no matter how late he may come. 不管他來的多么晚，我都會等他。

② may +完成式(指過去) ，主句結構不限。如：

You mustn’t be proud whatever / no matter what great progress you may have made. 不管你取得了多么大的進步，你也不能驕傲(from www.hz123456.com)。

We must respect him no matter what / whatever mistakes he may have made. 不管他翻過什么錯誤，我們必須尊敬他。

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