(2) 省略條件句的主語和其后的動詞be。若主從句主語一致，且謂語部分包含有動詞be，通常可將主語和動詞be省略：

If repaired earlier, the tractor would not have broken down. 要是早點兒修一下，拖拉機就不會拋錨了。(=If it had been repaired earlier…)

(3) 省略“it+be”：

If necessary, I would send more farm-hands to help you. 如果需要的話我會派更多的民工去你。(=If it is necessary...) 

(4) 省略整個條件從句。這樣的省略通常需要借助一定的上下文，即省略條件從句后，所剩下的主句的意思在一定的上下文中意思是清楚的：

I might see her personally. It would be better. 我可以親自去看她，這樣好一些。(=…If I saw her personally, it would be better.)

三、七類使用虛擬語氣的常見從句

1. wish后的賓語從句用虛擬語式

要表示與現在事實相反的愿望，從句謂語一般過去時或過去進行時，表示與過去相反的愿望，從句謂語用過去完成時或would / could+have +過去分詞，表示將來沒有把握或不太可能實現的愿望，用would (could)＋動詞原形：

I wish I were [was] better looking. 要是我長得漂亮些就好了。

She wished she had stayed at home. 她后悔的是她當時要是留在家里就好了。

I wish you would go with us tomorrow. 要是你明天同我們一起去就好了。

注：從句的時態只與從句所指的時間有關，而與wish的時態無關，比較：

I wish I were rich. 要是我現在有錢就好了。

I wish I had been rich. 要是那時我有錢就好了。

I wished I were rich. 當時我后悔自己沒有錢。

I wished I had been rich. 當時我后悔自己曾經沒有錢。

2. if only的句子后用虛擬語氣

if only 與 I wish一樣，也是表示與事實相反的愿望的，其后所虛擬語氣的時態與 wish后所接時態的情況相同：

If only I were [was] better looking. 要是我長得漂亮些就好了。

If only I had listened to my parents! 我要是當時聽了父母的話就好了。

If only she would go with me! 她要是愿意和我一道去就好了!

注：if only 通常獨立使用，沒有主句。

3. as if (as though) 從句中的虛擬語氣

以as if (as though)引導的方式狀語從句或表語從句，有時用虛擬語氣，若表示與現在事實相反，謂語動詞用一般過去時；若表示與過去事實相反，用過去完成時；表示將來的可能性不大，用would (might, could)+動詞原形：

He acts as if he knew me. 他顯得認識我似的。

They treat me as though I were a stranger.  他們待我如陌生人。

He talks as if he had been abroad. 他說起話來好像曾經出過國。

注：(1) 從句所表示的內容若為事實或可能為事實，也可用陳述語氣：

It looks as if we’ll be late. 我們似乎要遲到了。

This meat tastes as if it has already gone bad. 這肉吃起來似乎已經壞了。

在現代英語中，有時即使從句內容不是事實，也可能用陳述語氣：

I feel as if [as though] I’m floating on air. 他感到好像漂浮在空中。

The stuffed dog barked as if it is [were, was] a real one. 玩具狗叫起來像真狗。

(2) 注意 It isn’t as if…的翻譯：

It isn’t as if he were poor. 他不像窮的樣子(或他又不窮)。

It isn’t as if you were going away for good. 又不是你離開不回來了。

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